Study Python with Spder

Python With Spyder 3: Functions and Scoping

variable|arguments pass in

x=10
def myfun1(x):
    y=x**2
    x=27
    return y

print('f=',myfun1(5))
print ('x=',x)

f= 25
x= 10

global variable

z=10
def myfun2(x):
    global z
    y=x**2+z
    z=27
    return y

print('f=',myfun2(5))
print ('z=',z)

f= 25
x= 10
f= 35
z= 27

multiple arguments

x=1
y=2
z=3

def myfun3(x,y,z):
    out=x**2+y**2+z**2
    return out

print('f=',myfun3(x,y,z))

f= 14

optional arguments

python能夠分根據變量名進行識別

x=1
y=2
z=3

def myfun4(x=0,y=0,z=0):
    out=x**2+y**2+z**2
    return out

print('f=',myfun4(x,y))
print('f=',myfun4(x,y,z))
print('f=',myfun4(y=y,z=z))        
#below 3 funcation shuld be same result
print('f=',myfun4(y=x,z=y),myfun4(0,1,2),myfun4(y=1,z=2)) 


f= 5
f= 14
f= 13
f= 5 5 5

Python With Spyder 4: Strings, Indexing, and Slicing

#String are immutable.
x="abcdefghijklmnopqrstuvwxyz"
#字符長度
print(len(x))   
y='hello'
#字符合並
print(x+y)
#字符切片
print(x[0])
x[-1]
x[3:11]  
x[:5]
x[4:]
#大寫
print(x.upper())
#split
z="This is a Test"
print(z.split(" "))
#conver number to string
print(type(45.784))
print(type(str(45.784)))


print(x[0])
a

x[-1]
Out[13]: 'z'

x[3:11]  
Out[14]: 'defghijk'

x[:5]
Out[15]: 'abcde'

x[4:]
Out[16]: 'efghijklmnopqrstuvwxyz'

print(x.upper())
ABCDEFGHIJKLMNOPQRSTUVWXYZ

z="This is a Test"
print(z.split(" "))
['This', 'is', 'a', 'Test']

print(type(45.784))
<class 'float'>

print(type(str(45.784)))
<class 'str'>

Python With Spyder 5: Lists

Lists are mutable
Vector:
     Has a single index
     Has a length
     Has a data type
Matrix
     Has a number of rows
     Has a numnber of column
     Has a data type
List
     Has a length

x=["Dog",3,7,123,"House"]
print(x)
#List切片
print(x[0])      
print(x[-1])
print(x[1:3])
#修改List
y=x       #這個只是符賦地址信息，兩個變量指向同一List
print('x=',x)
print('y=',y)
x[2]="Hello"      #結果是兩個變量會同時被修改
print('x=',x)
print('y=',y)   
y=list(x)    #內存複製
x[2]=7.123
print('x=',x)
print('y=',y)


#convert string to List
s="Hello"
print(list(s))  

##########################################
x=["Dog",3,7,123,"House"]

print(x)
['Dog', 3, 7, 123, 'House']

#List切片

print(x[0])      
Dog

print(x[-1])
House

y=x       #這個只是符賦地址信息，兩個變量指向同一List

print('x=',x)
x= ['Dog', 3, 7, 123, 'House']

print('y=',y)
y= ['Dog', 3, 7, 123, 'House']

x[2]="Hello"      #結果是兩個變量會同時被修改

print('x=',x)
x= ['Dog', 3, 'Hello', 123, 'House']

print('y=',y)   
y= ['Dog', 3, 'Hello', 123, 'House']

y=list(x)    #內存複製

x[2]=7.123

print('x=',x)
x= ['Dog', 3, 7.123, 123, 'House']

print('y=',y)
y= ['Dog', 3, 'Hello', 123, 'House']

s="Hello"

print(list(s))  
['H', 'e', 'l', 'l', 'o']

Python With Spyder 7:The Objects

Product Structrue
    SKU
    Product Name
    Brand
    Manufacturer
    As a list [width,depth,height,units]
    Weight
    Units

#Create Single Object
class VGSM:
    SKU="DAR023"
    Name="VG Skim Milk"
    Brand="Very Good Brands"
    Manufacturer="Georgia Dairy,Inc."
    Dimension=[8,8,10,"in"]
    Weight=2.2
    WtUnits="lbs"
    
print(VGSM.SKU)
print(VGSM.Dimension[2])
print(VGSM.Weight)

#########################

DAR023
10
2.2

Python With Spyder 8-11:The Objects

Create Object Template

#__init__(self,xxx)是標準格式
##__xxx private variabe
#Attribute:Version,def
#Method:
class Product:
    
    Version="Ver 1.2 Rev 3"
    
    def __init__(self,sku,name,brand,manu,dims,wt,wtunits):
        self.SKU=sku
        self.Name=name
        self.Brand=brand
        self.Manufacturer=manu
        self.Dimensions=dims
        self.Weight=wt
        self.WtUnits=wtunits
    
    def Print(self):
        out="\nName:\t\t"+self.Name+"\nSku:\t\t"+self.SKU+"\n"+\
        "Brand:\t\t"+self.Brand+"nManufacturer:\t"+self.Manufacturer+"\n"+\
        "Dimensions\n"+\
        "\tWidth:\t"+str(self.Dimensions[0])+self.Dimensions[3]+"\n"+\
        "\tDepth:\t"+str(self.Dimensions[1])+self.Dimensions[3]+"\n"+\
        "\tHeight:\t"+str(self.Dimensions[2])+self.Dimensions[3]+"\n\n"+\
        "\tWeight:\t"+str(self.Weight)+self.WtUnits+"\n"
        print(out)

#Encapsulation of Object    
    def SetPhone(self,PhoneNum):
        # Phone number format is XXX-XXX-XXXX
    
        dgts="0123456789"
    
        BadFmt=False
        if type(PhoneNum)!=type("abc") or len(PhoneNum)!=12:
            BadFmt=True
            
        if PhoneNum[3]!="-" or PhoneNum[7]!="-":
            BadFmt=True
           
        if not ( PhoneNum[0] in dgts and PhoneNum[1] in dgts and \
                PhoneNum[2] in dgts and PhoneNum[4] in dgts and \
                PhoneNum[5] in dgts and PhoneNum[6] in dgts and\
                PhoneNum[8] in dgts and PhoneNum[9] in dgts and \
                PhoneNum[10] in dgts and PhoneNum[11] in dgts):
            BadFmt=True
        
        if BadFmt:
            print("Wrong phone number format. Use \"xxx-xxx-xxxx\"")
            return False
        
        self.__PhoneNumber = PhoneNum
        
        return True
    
    def GetPhone(self):
        return self.__PhoneNumber
    
    def PrintShelfVolume(self):
        volume = self.Dimensions[0]*self.Dimensions[1]*self.Dimensions[2]
        out = "Shelf Volume = " + str(volume) + " " + \
                self.Dimensions[3] + " cubed\n"
        print(out)
        return volume
    
    def FootprintArea(self):
        return self.Dimensions[0]*self.Dimensions[1]

 Object Attribute

Milk23=Product("DAR023","VG Skim Milk","Very Good Brands","Georgia Dairy,Inc.",[8,8,10,"in"],2.2,"lbs")
Cer12=Product("CER012","VG Corn Flakes","Very Good Brands","House Products, Inc.",[9,3,11,"in"],18,"oz")
print("Milk23.Weight:",Milk23.Weight)
print("Cer12.Dimensions:",Cer12.Dimensions)

############################################################
Milk23.Weight: 2.2
Cer12.Dimensions: [9, 3, 11, 'in']

Cer12.Print()
#List all Attribute and Method of Product
dir(Cer12)


Name:           VG Corn Flakes
Sku:            CER012
Brand:          Very Good BrandsnManufacturer:  House Products, Inc.
Dimensions
        Width:  9in
        Depth:  3in
        Height: 11in

        Weight: 18oz

Out[8]: 
['Brand',
 'Dimensions',
 'FootprintArea',
 'GetPhone',
 'Manufacturer',
 'Name',
 'Print',
 'PrintShelfVolume',
 'SKU',
 'SetPhone',
 'Version',
 'Weight',
 'WtUnits',
 '__class__',
 '__delattr__',
 '__dict__',
 '__dir__',
 '__doc__',
 '__eq__',
 '__format__',
 '__ge__',
 '__getattribute__',
 '__gt__',
 '__hash__',
 '__init__',
 '__init_subclass__',
 '__le__',
 '__lt__',
 '__module__',
 '__ne__',
 '__new__',
 '__reduce__',
 '__reduce_ex__',
 '__repr__',
 '__setattr__',
 '__sizeof__',
 '__str__',
 '__subclasshook__',
 '__weakref__']

Object priviate methods|function

#Input data
Milk23.SetPhone("305-798-2345")
#Output data
print(Milk23.GetPhone())
#Wrong Foramtion will poput Waring
#Milk23.SetPhone("12345678")


305-798-2345

Inheritance

# Define the MilkProduct class
class MilkProduct(Product):
    
    Category = "Dairy"
    Storage = "Refrigerated"
    
    def __init__(self,sku,name,brand=None,manu=None,dims=None,wt=None, \
        wtunits=None,vol=None,fatcat="Whole",expir=None,servsize=None, \
        numserve=None,cals=None,fatgrams=None,fatcals=None,phone=None):
        
        #call defination of Product Object
        Product.__init__(self,sku,name,brand,manu,dims,wt,wtunits)
        
        self.Volume = vol
        self.FatCategory = fatcat
        self.ExpirationDate = expir
        self.ServingSize = servsize
        self.NumberServings = numserve
        self.Calories = cals
        self.FatGrams = fatgrams
        self.FatCalories = fatcals
        
        if phone!=None:
            self.SetPhone(phone)
       
#%%    Define the LaundreyDetergentProduct class   
    
class LaundryDetergentProduct(Product):
    
    Category = "Laundry"

    def __init__(self,sku,name,brand=None,manu=None,dims=None,wt=None, \
        wtunits=None,numloads=None,sudslevel="Not HE",form="Powder", \
        scent=None,phone=None):
        
        Product.__init__(self,sku,name,brand,manu,dims,wt,wtunits)
        
        self.NumberLoads = numloads
        self.SudsingLevel = sudslevel
        self.PhysicalForm = form
        self.Scent = scent
        
        if phone!=None:
            self.SetPhone(phone)

#%%   Create two instances     

Milk23 = MilkProduct("DAR023","VG Skim Milk","Very Good Brands", \
        "Georgia Dairy",[8,8,10,"in"],2.2,"lbs","1Gal","Skim","2014-09-27", \
        8,16,90,0,0,"305-735-4353")
        
Det16 = LaundryDetergentProduct("LAU016","VG Laundry Detergent", \
        "Very Good Brands",dims=[9,3,11,"in"],wt=18,wtunits="oz", \
        numloads=72,sudslevel="HE",form="Liquid")

Python With Spyder 12: Dictionary

SKUDict = {
    "Milk23":"VG Skim Milk",
    "Milk24":"VG 1% Milk",
    "Milk25":"VG 2% Milk",
    "Milk26":"VG Whole Milk",
    "Cer12":"VG Corn Flakes",
    "Cer13":"VG Toasted Oats",
    "Cer14":"VG Toasted Rice"   
}

print(SKUDict["Cer12"])
#Revise the Key Value
SKUDict["Cer12"] = "VG Corn Flakes (test)"
print(SKUDict["Cer12"])
#Add new item into Dictionary
SKUDict['Cer15'] = "VG Rice Flakes"


VG Corn Flakes
VG Corn Flakes (test)

# Create an empty dictionary use {} or dict()

SKUDict = {}
SKUDict = dict()

SKUDict["Milk23"] = "VG Skim Milk"
SKUDict["Milk24"] = "VG 1% Milk"
SKUDict["Milk25"] = "VG 2% Milk"
SKUDict["Milk26"] = "VG Whole Milk"
SKUDict["Cer12"] = "VG Corn Flakes"
SKUDict["Cer13"] = "VG Toasted Oats"
SKUDict["Cer14"] = "VG Toasted Rice"
SKUDict['Cer15'] = "VG Rice Flakes"

#Get the Dictionary kyes and values
SKUDict.keys()
SKUDict.values()
#Remove keys and values
SKUDict.pop('Milk25')
SKUDict.popitem()
#key in Dictionary check
'Milk23' in SKUDict
'Milk2' in SKUDict

dir(SKUDict)

# Copying the dictionary name does not copy
# the dictionary data!

TestDict = SKUDict
TestDict
SKUDict

SKUDict['Cer15'] = "Hello!"
TestDict
#Actual Copy dictionary
TestDict = dict(SKUDict)
TestDict
SKUDict

SKUDict['Milk23'] = "Hello!"
SKUDict
TestDict

Python With Spyder 13:for Loop in Python

CEOs = ["David M. Zaslav","Michael T. Fries","Mario J. Gabelli",
        "Satya Nadella","Nicholas Woodman","Gregory B. Maffei",
        "Lawrence J. Ellison","Steven M. Mollenkopf","David T. Hamamoto",
        "Leslie Moonves","Philippe P. Dauman","Robert A. Iger",
        "Joseph W. Brown Jr.","Marissa A. Mayer","Leonard S. Schleifer",
        "Joshua W. Sapan","Marc Benioff","Jeffrey M. Leiden",
        "Herve Hoppenot","Jeffrey L. Bewkes","Gary W. Loveman",
        "Eric J. Foss","Zachary Nelson","Martine Rothblatt",
        "William J. McMorrow","W. Nicholas Howley","Steve Ells",
        "Howard M. Lorber","Rex W. Tillerson","Brian C. Cornell",
        "Montgomery F. Moran","James Dimon","Jonathan Oringer",
        "Paul M. Rady","Brian L. Roberts","Craig A. Leavitt",
        "Lamberto Andreotti","Ari Bousbib","Ronald N. Tutor",
        "Stephen A. Wynn","Thomas B. Barker","Stephen P. MacMillan",
        "Wayne T. Smith","Larry J. Merlo","Robert J. Hugin",
        "Michael J. Saylor","John D. Wren","Brian Harris",
        "K. Rupert Murdoch","Laurence D. Fink","Leslie H. Wexner",
        "James L. Dolan","W. James McNerney, Jr","Carol Meyrowitz",
        "James P. Gorman","Peter Liguori","David M. Cote",
        "A. Jayson Adair","Brian D. Jellison","James M. Cracchiolo",
        "Kenneth I. Chenault","Lloyd C. Blankfein","Barry D. Zyskind",
        "Darren R. Huston","Howard Schultz","Kenneth C. Frazier",
        "Randall L. Stephenson","Leonard Bell","Peter M. Carlino",
        "Alex Gorsky","David J. Lesar","Margaret C. Whitman",
        "Richard D. Fairbank","Jay S. Fishman","Andrew N. Liveris",
        "Alan G. Lafley","William R. Berkley","John G. Stumpf",
        "Michael F. Neidorff","Paul C. Saville","Indra K. Nooyi",
        "C. Douglas McMillon","Phebe N. Novakovic","John C. Martin",
        "Jeffrey R. Immelt","John S. Watson","John J. Legere",
        "George A. Scangos","Alan B. Miller","Lowell C. McAdam",
        "Muhtar Kent","Ian C. Read","Virginia M. Rometty",
        "Paul A. Ricci","Stuart A. Miller","Shantanu Narayen",
        "Marillyn A. Hewson","Alan H. Auerbach","Ryan M. Lance",
        "Richard H. Anderson","Richard E. Muncrief","Marc N. Casper",
        "Ronald F. Clarke","Thomas F. Farrell, II","John R. Strangfeld",
        "Samuel R. Allen","Kevin M. Sheehan","Richard A. Gonzalez",
        "Miles S. Nadal","Paal Kibsgaard","Gregory D. Wasson",
        "Brad D. Smith","Hamid R. Moghadam","John T. Chambers",
        "Scott A. McGregor","Dave Schaeffer","Gary E. Dickerson",
        "Alex A. Molinaroli","Marc Holliday","Patricia A. Woertz",
        "Miles D. White","Thomas M. Rutledge","Glenn K. Murphy",
        "Irene B. Rosenfeld","Gregory E. Johnson","Mary T. Barra",
        "John D. Finnegan","Jeffrey Weiner","Martin L. Flanagan",
        "Greg C. Garland","Robert A. Walker","Douglas R. Oberhelman",
        "Mark T. Bertolini","Martin B. Anstice","Fabrizio Freda",
        "Mark Fields","Wesley G. Bush","John Richels",
        "Jay T. Flatley","Stephen J. Hemsley","Richard K. Templeton",
        "Arne M. Sorenson","James T. Prokopanko","Gregory J. Goff",
        "Lorenzo Delpani","David Simon","John J. Koraleski",
        "Richard J. Kramer","Laura J. Alber","Mark G. Parker",
        "Robert D. Lawler","Martin S. Craighead","Brian T. Moynihan",
        "Steven A. Kandarian","Michael L. Corbat","Brian D. Goldner",
        "Mikkel Svane","David M. Cordani","John B. Hess",
        "Daniel S. Glaser","Inge G. Thulin","Robert A. Niblock",
        "Frederick W. Smith, III","Paul L. Berns","Stephen P. Holmes",
        "Joseph L. Hooley","John J. Donahoe","Robert A. Bradway",
        "William P. Sullivan","Kent J. Thiry","Charles E. Bunch",
        "Michael S. Burke","Robert J. Willett","Klaus Kleinfeld",
        "David G. DeWalt","Joseph R. Swedish","Gary R. Heminger",
        "Ajay Banga","Trevor Fetter","Mario Longhi",
        "Ellen J. Kullman","Eric C. Wiseman","Ian M. Cook",
        "Thomas J. Wilson","G. Frederick Wilkinson","Hubert Joly",
        "George Paz","William A. Cooper","Michael I. Roth",
        "Jeff M. Fettig","Donald E. Washkewicz","Robert L. Parkinson, Jr.",
        "Howard W. Lutnick","James D. Taiclet, Jr.","Steven E. Simms",
        "Terry J. Lundgren","James J. Volker","Scott D. Sheffield",
        "John F. Lundgren","Christopher M. Crane"]
#%%
CEOFirstNames = ["David","Michael","Mario",
            "Satya","Nicholas","Gregory",
            "Lawrence","Steven","David",
            "Leslie","Philippe","Robert",
            "Joseph","Marissa","Leonard",
            "Joshua","Marc","Jeffrey",
            "Herve","Jeffrey","Gary",
            "Eric","Zachary","Martine",
            "William","Nicholas","Steve",
            "Howard","Rex","Brian",
            "Montgomery","James","Jonathan",
            "Paul","Brian","Craig",
            "Lamberto","Ari","Ronald",
            "Stephen","Thomas","Stephen",
            "Wayne","Larry","Robert",
            "Michael","John","Brian",
            "Rupert","Laurence","Leslie",
            "James","James","Carol",
            "James","Peter","David",
            "Jayson","Brian","James",
            "Kenneth","Lloyd","Barry",
            "Darren","Howard","Kenneth",
            "Randall","Leonard","Peter",
            "Alex","David","Margaret",
            "Richard","Jay","Andrew",
            "Alan","William","John",
            "Michael","Paul","Indra",
            "Douglas","Phebe","John",
            "Jeffrey","John","John",
            "George","Alan","Lowell",
            "Muhtar","Ian","Virginia",
            "Paul","Stuart","Shantanu",
            "Marillyn","Alan","Ryan",
            "Richard","Richard","Marc",
            "Ronald","Thomas","John",
            "Samuel","Kevin","Richard",
            "Miles","Paal","Gregory",
            "Brad","Hamid","John",
            "Scott","Dave","Gary",
            "Alex","Marc","Patricia",
            "Miles","Thomas","Glenn",
            "Irene","Gregory","Mary",
            "John","Jeffrey","Martin",
            "Greg","Robert","Douglas",
            "Mark","Martin","Fabrizio",
            "Mark","Wesley","John",
            "Jay","Stephen","Richard",
            "Arne","James","Gregory",
            "Lorenzo","David","John",
            "Richard","Laura","Mark",
            "Robert","Martin","Brian",
            "Steven","Michael","Brian",
            "Mikkel","David","John",
            "Daniel","Inge","Robert",
            "Frederick","Paul","Stephen",
            "Joseph","John","Robert",
            "William","Kent","Charles",
            "Michael","Robert","Klaus",
            "David","Joseph","Gary",
            "Ajay","Trevor","Mario",
            "Ellen","Eric","Ian",
            "Thomas","Frederick","Hubert",
            "George","William","Michael",
            "Jeff","Donald","Robert",
            "Howard","James","Steven",
            "Terry","James","Scott",
            "John","Christopher"]
#%%
CEOLastNames = ["Zaslav","Fries","Gabelli",
                "Nadella","Woodman","Maffei",
                "Ellison","Mollenkopf","Hamamoto",
                "Moonves","Dauman","Iger",
                "Brown","Mayer","Schleifer",
                "Sapan","Benioff","Leiden",
                "Hoppenot","Bewkes","Loveman",
                "Foss","Nelson","Rothblatt",
                "McMorrow","Howley","Ells",
                "Lorber","Tillerson","Cornell",
                "Moran","Dimon","Oringer",
                "Rady","Roberts","Leavitt",
                "Andreotti","Bousbib","Tutor",
                "Wynn","Barker","MacMillan",
                "Smith","Merlo","Hugin",
                "Saylor","Wren","Harris",
                "Murdoch","Fink","Wexner",
                "Dolan","McNerney","Meyrowitz",
                "Gorman","Liguori","Cote",
                "Adair","Jellison","Cracchiolo",
                "Chenault","Blankfein","Zyskind",
                "Huston","Schultz","Frazier",
                "Stephenson","Bell","Carlino",
                "Gorsky","Lesar","Whitman",
                "Fairbank","Fishman","Liveris",
                "Lafley","Berkley","Stumpf",
                "Neidorff","Saville","Nooyi",
                "McMillon","Novakovic","Martin",
                "Immelt","Watson","Legere",
                "Scangos","Miller","McAdam",
                "Kent","Read","Rometty",
                "Ricci","Miller","Narayen",
                "Hewson","Auerbach","Lance",
                "Anderson","Muncrief","Casper",
                "Clarke","Farrell","Strangfeld",
                "Allen","Sheehan","Gonzalez",
                "Nadal","Kibsgaard","Wasson",
                "Smith","Moghadam","Chambers",
                "McGregor","Schaeffer","Dickerson",
                "Molinaroli","Holliday","Woertz",
                "White","Rutledge","Murphy",
                "Rosenfeld","Johnson","Barra",
                "Finnegan","Weiner","Flanagan",
                "Garland","Walker","Oberhelman",
                "Bertolini","Anstice","Freda",
                "Fields","Bush","Richels",
                "Flatley","Hemsley","Templeton",
                "Sorenson","Prokopanko","Goff",
                "Delpani","Simon","Koraleski",
                "Kramer","Alber","Parker",
                "Lawler","Craighead","Moynihan",
                "Kandarian","Corbat","Goldner",
                "Svane","Cordani","Hess",
                "Glaser","Thulin","Niblock",
                "Smith","Berns","Holmes",
                "Hooley","Donahoe","Bradway",
                "Sullivan","Thiry","Bunch",
                "Burke","Willett","Kleinfeld",
                "DeWalt","Swedish","Heminger",
                "Banga","Fetter","Longhi",
                "Kullman","Wiseman","Cook",
                "Wilson","Wilkinson","Joly",
                "Paz","Cooper","Roth",
                "Fettig","Washkewicz","Parkinson",
                "Lutnick","Taiclet","Simms",
                "Lundgren","Volker","Sheffield",
                "Lundgren","Crane",
                ]

#%%
"""
The for loop in Python:

for Variable in Iterable:
    code line 1
    code line 2
    etc.

In some other languages:

for(i=0;i<n;i++) {
    code line 1
    code line 2
    etc.
}

""" 
#%%
def GetItems(InputList,IndexList):
    
    Out = []
    
    for Item in IndexList:
        Out.append(InputList[Item])
    
    return Out

GetItems(CEOs,[1,3,15])

#%%

def mean(Data):
    
    n = len(Data)
    
    Ans = 0.0
    for x in Data:
        #Ans=Ans+x
        Ans += x
    
    Ans /= n
    return Ans
 
#%%
   
def sd(Data):
    
    Xbar = mean(Data)
    n = len(Data)
    
    Ans = 0.0
    for x in Data:
        Ans += (x-Xbar)**2
    
    Ans /= (n-1)
    Ans = Ans**0.5
    
    return Ans
#%%

range(10)
range(len(CEOs))
range(50,len(CEOs))

#%%

def cor(X,Y):
    
    Xbar = mean(X)
    Ybar = mean(Y)
    sdX = sd(X)
    sdY = sd(Y)
    
    Cov = 0.0
    for i in range(len(X)):
        Cov += (X[i]-Xbar)*(Y[i]-Ybar)
    
    Cov /= (len(X)-1)
    
    Ans = Cov/(sdX*sdY)
    return Ans

#%%
# map(function,list)   
  
list(map(len,CEOFirstNames))

cor(list(map(len,CEOFirstNames)),list(map(len,CEOLastNames)))    

##################################################
Out[27]: -0.04476377466422977

Python With Spyder 14: If Statements

"""
The if statement loop in Python:

if logical expression:
    code block
elif logical expression:                # Optional
    code block
else:
    code block                          # Optional

# In Excel
# =if(logical expression, value if true, value if false)          

""" 

#%%

def GetListItems(InputList,IndexList):
    
    if not isinstance(InputList,list):
        print("Error: InputList is not a list! An empty list is returned.")
        return []
    
    if not isinstance(IndexList,list):
        if isinstance(IndexList,int):
            tmp = IndexList
            IndexList = []
            IndexList.append(tmp)
        else:
            print("Error: IndexList is not a list! An empty list is returned.")
            return []
 
    Out = []
    
    n = len(InputList)

    for Item in IndexList:
        if isinstance(Item,int):
            if Item >= -n and Item < n:
                Out.append(InputList[Item])
            else:
                print("Warning: Index out of range! The value None is returned.")
                Out.append(None)
        else:
            print("Warning: Index is not an integer! The value None is returned.")
            Out.append(None)
            

    return Out

GetListItems(CEOs,[1,3,15])

GetListItems(CEOs,"abc")

x = {}
x['a'] = 5
x['b'] = "abc"
GetListItems(x,[1,3,15])
GetListItems(CEOs,[1,3,200])
GetListItems(CEOs,[1,3,-10])
GetListItems(CEOs,[1,-201,-30])
GetListItems([],[1,3,15])
GetListItems(CEOs,15)
GetListItems(CEOs,[15])

###################################################################
Error: IndexList is not a list! An empty list is returned.
Error: InputList is not a list! An empty list is returned.
Warning: Index out of range! The value None is returned.
Warning: Index out of range! The value None is returned.
Warning: Index out of range! The value None is returned.
Warning: Index out of range! The value None is returned.
Warning: Index out of range! The value None is returned.
Out[29]: ['Joshua W. Sapan']