原創:叫我詹躲躲 來源:掘金 連接:juejin.im/post/5f05e1…python
print('hello world!')
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python -v
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message = 'hello world!'
print(message) 複製代碼
name = 'jetty'
print(name.title()) #Jetty 首字母大寫 print(name) jetty name.upper() #JEETY 轉大寫 name.lower() #jetty 轉小寫 複製代碼
first_name = 'hongzhu'
last_name = 'zhan' full_name = last_name +" "+ first_name print(full_name) zhan hongzhu 複製代碼
language = 'python\nJavascript\nC\nRust'
print(language) 打印 python Javascript C Rust 複製代碼
_blank = ' python '
print(_blank.rstrip()) #去除右側空白 print(_blank.strip()) #去除兩側空白 print(_blank.lstrip()) #去除左側空白 複製代碼
num = 2.340
print(int(num)) #整型 2 print(float(num)) #浮點型 2.34 複製代碼
color = ['red','green','yellow','pink']
#訪問元素 print(color[0]) ##red #修改 color[0] = 'black' #添加元素 color.append('orange') #插入元素 color.insert(0,'blue') #插到第一位 print(color) #刪除元素 del color[0] #刪除當前元素 color.pop() #刪除數組最後一個元素 color.remove('red') #刪除紅色 複製代碼
num_list = [1,2,3,4,2,1,3,1,2]
num_list.sort() print(num_list) [1, 1, 1, 2, 2, 2, 3, 3, 4] 複製代碼
num_list = [1,2,3,4,2,1,3,1,2]
print(sorted(num_list)) [1, 1, 1, 2, 2, 2, 3, 3, 4] 複製代碼
num_list = [1,2,3,4,2,1,3,1,2]
num_list.reverse() print(num_list) [2, 1, 3, 1, 2, 4, 3, 2, 1] 複製代碼
num_list = [1,2,3,4,2,1,3,1,2]
print(len(num_list)) 9 複製代碼
num_list = [1,2,3,4,2,1,3,1,2]
for i in num_list: print(i,end=" ") #一行顯示 複製代碼
num_list = [1,2,3,4,2,1,3,1,2]
for i in range(len(num_list)): print(num_list[i],end=" ") 複製代碼
squares = []
for i in range(1,6): squares.append(i**2) print(squares) [1, 4, 9, 16, 25] 複製代碼
num_list = [1,2,3,4,2,1,3,1,2]
print(max(num_list)) 4 print(min(num_list)) 1 print(sum(num_list)) 19 複製代碼
squeres = [value**2 for value in range(1,11)]
print(squeres) [1, 4, 9, 16, 25, 36, 49, 64, 81, 100] 複製代碼
odd_number =[]
for i in range(1,11,2): odd_number.append(i) print(sum(odd_number)) 複製代碼
three_nmu = []
for i in range(3, 91): if (i % 3==0): three_nmu.append(i) print(three_nmu) 複製代碼
squares = []
for i in range(3,11): squares.append(i**3) print(squares) 複製代碼
squares = [i**3 for i in range(3,11)]
print(squares) 複製代碼
num_list = [1,2,3,4,2,1,3,1,2]
print(num_list[0:5]) [1, 2, 3, 4, 2] #從第一個開始取值到第五位 print(num_list[:5]) [1, 2, 3, 4, 2] #默認會從第一個開始取值 print(num_list[5:]) [1, 3, 1, 2] #取後面的4位 複製代碼
dimensions = (100,300)
print(dimensions[0]) 100 for i in dimensions: print(i) 100 300 複製代碼
num_list = [1, 2, 3, 4, 2, 1, 3, 1, 2]
for i in num_list: if i == 2: print(i) 複製代碼
num_list = [1, 2, 3, 4, 2, 1, 3, 1, 2]
for i in num_list: if i != 2: print(i) 複製代碼
num_list = [1, 2, 3, 4, 2, 1, 3, 1, 2]
for i in num_list: if i >=1 and i <=2: print(i) 複製代碼
alien = {'color':0,'points':1}
print(alien['color']) ##color 複製代碼
alien = {'color':0,'points':1}
alien['color'] = 'red' print(alien) {'color': 'red', 'points': 1} 複製代碼
alien = {'color':0,'points':1}
del alien['color'] print(alien) 複製代碼
people_nums1 = {'name':'jetty','name1':'jack'}
people_nums2 ={'name':'kitty','name1':'james'} peoples = [people_nums1,people_nums2] for i in peoples: print(i) 複製代碼
ipt = input('你是小黃麼?1(true) or 2(false)?')
if ipt =='1': print('是本人') else: print('不是本人') 複製代碼
print(4 % 2) 0
print(4 // 2) 2 複製代碼
count = 0
arr = [] while count < 20: for j in range(1, 100): if j % 11 == 0: count = count+1 arr.append(j) print(arr) 複製代碼
#簡單求和
def num_sum(arr): result =0 for i in arr: result =result+i return result print(num_sum([1,2,3,4])) 10 複製代碼
def num_sum(arr=[1,2,3]):
result =0 for i in arr: result =result+i return result print(num_sum()) 6 複製代碼
def make_prize(*top):
return top print(make_prize(1)) print(make_prize(1,2,3)) print(make_prize(1,3,4,5)) print(make_prize(1,1,1,1,1)) #返回 (1,) (1, 2, 3) (1, 3, 4, 5) (1, 1, 1, 1, 1) 複製代碼
# 隨機數
import random print(random.randint(1,19)) 複製代碼
class Dog():
def __init__(self,name,age): self.name =name self.age = age def sit(self): print(self.name+''+self.age) dog = Dog('jeety',24) print(dog.name) 複製代碼
class Car():
def __init__(self,make,model,year): self.make = make self.model = model self.year = year def getCarName(self): print(self.model) car = Car('audi','ad4',2016) print(car.make) 複製代碼
class Car():
def __init__(self,name): self.name = name class Elastic(Car): def __init__(self, name): super().__init__(name) myTesla = Elastic('tesla') print(myTesla.name) 複製代碼
class Car():
def __init__(self,make,name,color): self.make = make self.name = name self.color = color def getCarName(self): print('獲取車的名字爲'+self.name+'獲取汽車的顏色'+self.color) class Batery(): def __init__(self,batery='60'): self.batery = batery def discribe_batery(self): print('This car has'+str(self.batery)+'batery') class Elatrity(Batery): def __init__(self, batery): super().__init__(batery) self.batery = Batery() elatrity = Elatrity('100') print(elatrity.discribe_batery()) 複製代碼
f = open('file.txt',mode="w",encoding='utf-8')
print(f) f.write('叫我詹躲躲\n') f.write('叫我詹躲躲1\n') f.close() 複製代碼
import json
numbers = [1,2,23,3,4,5,6,7,87] filename = 'numbers.json' with open(filename,'w') as f_obj: json.dump(numbers,f_obj) 複製代碼
import json
username = input('存儲輸入的數據') filename = 'numbers.json' with open(filename,'w') as f_obj: json.dump(username,f_obj) 複製代碼
import json
filename = 'numbers.json' with open(filename) as f_obj: username = json.load(f_obj) print('Welcome back',username) 複製代碼
import json
filename = 'numbers.json' try: with open(filename) as f_obj: username = json.load(f_obj) except FileNotFoundError: username = input('存儲輸入的數據') with open(filename,'w') as f_obj: json.dump(username,f_obj) else: print('Welcome back',username) 複製代碼
import json
def get_username(): filename = 'numbers.json' try: with open(filename) as f_obj: username = json.load(f_obj) except FileNotFoundError: return None else: return username def get_greeting(): username = get_username() if username: print('Welcome back',username) else: username = input('存儲輸入的數據') filename = 'numbers.json' with open(filename,'w') as f_obj: json.dump(username,f_obj) print('Welcome back',username) get_greeting() 複製代碼
f = open('index.txt',encoding='utf-8')
s = f.read() print(s) f.close() 複製代碼
f = open('index.txt',mode="w",encoding='utf-8')
f.write('叫我詹躲躲n') f.write('叫我詹躲躲1n') f.close() 複製代碼
import random
random.randint() #隨機數 import jieba #結巴 import wordcloud #詞雲 jieba.lcut('分割中文詞語的序列') #分割中文詞語的序列 word_cloud = wordCloud(font_path='msyh.ttc').generate('分割中文詞語') #生成詞雲對象 word_cloud.to_file('123.png') #保存到圖片 複製代碼
#面向對象編程
class Person: def __init__(self,name,sex,birthday): self.name = name self.sex = sex self.birthday = birthday def say(self,word): print(f'{self.name}說:"{word}"') zhang_san = Person('張三','男','2020202') zhang_san.say('12121') 複製代碼
lastname = 'hello'
firstname = 'world' print('個人名字是%s %s' %(lastname,firstname)) 複製代碼
%c #字符
%s #經過str來格式化 %i #有符號十進制整數 %d #有符號十進制整數 %u #無符號十進制整數 %o #八進制整數 %x #十六進制整數(小寫字母) %e #索引符號(小寫e) %E #索引符號(大寫E) %f #浮點實數 %g #%f和%e的簡寫 %G #%f和%E的簡寫 複製代碼
name = '老夫子'
age = 28 print('姓名:{},年齡{}'.format(name,age)) #姓名:老夫子,年齡28 複製代碼
#特色:
#1.使用lambda關鍵字建立函數 #2.沒有名字的函數 #3.匿名函數冒號後面的表達式有且只有一個,是表達式不是語句 #4.自帶return 複製代碼
def computer(x,y):
#計算兩數和 return x+y M = lambda x,y:x+y print(M(1,2)) 複製代碼
result = lambda a,b,c:a*b*c
print(result(12,121,1)) 複製代碼
age = 15
print('能夠參軍' if age>18 else '繼續上學') #直接調用 result = (lambda x,y:x if x>y else y)(2,5) 複製代碼
#階乘函數
def factorial(n): if n==1: return 1 else: return n*factorial(n-1) pass print(factorial(3)) 複製代碼
import os 文件操做模塊
def findFile(file_path): listRs = os.listdir(file_path) 獲得該路徑全部的文件夾 for fileItem in listRs: full_path = os.path.join(file_path,fileItem) if os.path.isdir(full_path): 判斷是否爲文件夾 findFile(full_path) else: print(fileItem) pass pass else: return findFile('F:\\7.代碼學習') 複製代碼
abs(-27) #絕對值
round(21.1123) #浮點近似值 pow(2,3) #冪 2**3 divmod(10,3) # 商餘 max(1,2,3,4) #最大值 min(1,2,3,4) #最小值 sum(1,2,3,4) #求和 eval() #動態執行表達式 複製代碼
int #整型
float #浮點型 str #字符類型 ord #返回對應字符的ASCII chr #數字轉字符 ASCII bool #boolean bin # 轉換二進制 hex #轉換爲十六進制 oct #八進制 list #元祖轉列表 tuple #元祖 dict #建立字典 bytes #轉爲字節 複製代碼
#all 用於斷定給定的可迭代參數中的全部元素是否都爲TRUE,若是是返回TRUE,不然返回FALSE,除了0,空,False 外都算TRUE
def all(iterable): for ele in iterable: if not ele: return False return True li = [1,2,3,4,5,6,False] print(all(li)) ##False 複製代碼
#所有爲false,返回false
def any(iterable): for ele in iterable: if ele: return False return True li = [0,False,''] print(any(li)) ##False 複製代碼
li = ['a','b','c']
for index,item in enumerate(li,7): print(index,item) #改下標 7 a 8 b 9 c 複製代碼
set1 = {'1','2'}
set2 = {'11','1'} #添加 add set1.add('3') #清空 clear() set1.clear() #取差集 difference set1.difference(set2) ##set1取set1中有的 #取交集 set1.intersection(set2) #取並集 set1.union(set2) set1 | set2 #末尾移除 set1.pop() #指定移除 set1.discard(3) #更新 update 合併一塊兒去重 set1.update(set2) 複製代碼
1-10,20-30,35-40
def threeSum(a1,a2,a3): return sum(a1+a2+a3) a1 = list(range(1,11)) a2 = list(range(20,31)) a3 = list(range(35,41)) print(threeSum(a1,a2,a3)) 複製代碼
def computers():
for i in range(1,101): for j in range(1,34): if i+j==100 and 3*j+i/3 ==100: print('大和尚有{}個,小和尚有{}個'.format(j,i)) pass computers() #大和尚有25個,小和尚有75個 複製代碼
li = [1,1,1,2,2,2,2,3,2,2,3,4,2,1,1]
def findUnionNumber(li): for item in li: if li.count(item)==1: return item pass print(findUnionNumber(li)) 複製代碼
dict ={}
for key in li: dict[key] = dict.get(key,0)+1 print(dict) 複製代碼
from collections import Counter
a = [1, 2, 3, 1, 1, 2] result = Counter(a) print(result) 複製代碼
import pandas as pd
a = pd.DataFrame([[1,2,3], [3,1,3], [1,2,1]]) result = a.apply(pd.value_counts) print(result) 複製代碼
li = [1,2,3,3,2,3,4,4,5,1,2,1]
def uniqueNum(li): set1 = set(li) for i in set1: li.remove(i) set2 = set(li) for j in set2: set1.remove(j) return set1 print(uniqueNum(li)) 複製代碼
#面向過程編程 根據業務從上到下開始編程
#類的結構 #類名 屬性 方法 class People: name = 'zhan', age = 20, def eat(self): print('正在吃飯') #建立對象 people = People() people.eat() 複製代碼
在類的內部,使用def定義的爲實例方法,第一個參數爲self,實例方法歸實例全部web
class People:
name = 'zhan', age = 20, def eat(self): print('正在吃飯') #建立對象 people = People() people.eat() #添加屬性 people.name2 = 'zhan' people.age2 = 22 複製代碼
class People:
# 初始化的操做,實例屬性,自動執行 def __init__(self): self.name = 'zhan' self.age = 20 def eat(self): print('正在吃飯') #建立對象 people = People() people.eat() 複製代碼
class People:
# 初始化的操做,實例屬性,自動執行 def __init__(self, name, age): self.name = name self.age = age def eat(self,food): print(self.name+food) #建立對象 people = People('叫我詹躲躲', 20) people.eat('正在吃飯') people.eat('洗澡') people.eat('跑步') 複製代碼
#相似於js裏面的this
class Person: def eat(self): print(id(self)) pass pass person = Person() person.eat() print(id(person)) #self和對象指向同一個內存地址,self就是對象的引用 # <__main__.Person object at 0x0000020864815CC0> 複製代碼
#__init__ :初始化實例屬性
# __str__ :自定義對象的格式 # __new__ :對象實例化 class Animal: def __str__(self): return '3213213123123' pass pass animal = Animal() print(animal) class Animal: def __str__(self): return '3213213123123' pass pass def __new__(cls,*args,**kwargs): print("----new執行---") return object.__new__(cls) 真正建立對象實例的 pass animal = Animal() print(animal) #__new__ 和__init__的區別 #__new__ 類的實例化方法,必須返回實例,不然建立不成功 #__init__數據屬性的初始化工做,認爲是實例的構造方法,接受實例化self並對其進行構造 #__new__ 至少一個參數是cls,表明要實例化的類 #__new__ 執行要比__init__早 複製代碼
# 屬性:
# name:玩家名稱 # blood:血量 # 方法: # tong() 捅一刀,掉10滴血 # kanren() 砍一刀掉15滴血 # chiyao() 補血10滴血 # __str__打印玩家的狀態 class Role: def __init__(self,name,blood): self.name = name self.blood = blood pass 砍人 def tong(self,enemy): enemy.blood -=10 info = '【%s】捅了【%s】一刀'%(self.name,enemy.name) print(info) pass 砍人 def kanren(self,enemy): enemy.blood -=15 info = '【%s】砍了【%s】一刀'%(self.name,enemy.name) print(info) pass 吃藥 def chiyao(self): self.blood +=10 info = '【%s】吃了一口藥,增長10滴血'%(self.name) print(info) pass def __str__(self): return '%s還剩下%s的血量'%(self.name,self.blood) xmcx = Role('西門吹雪',100) ygc = Role('葉孤城',100) while True: if xmcx.blood<=0 or ygc.blood<=0: break print('*********************') xmcx.tong(ygc) xmcx.kanren(ygc) print('*********************') ygc.tong(xmcx) ygc.chiyao() print('*********************') print(xmcx) print(ygc) """ ********************* 【西門吹雪】捅了【葉孤城】一刀 【西門吹雪】砍了【葉孤城】一刀 ********************* 【葉孤城】捅了【西門吹雪】一刀 【葉孤城】吃了一口藥,增長10滴血 ********************* 西門吹雪還剩下50的血量 葉孤城還剩下25的血量 ********************* 【西門吹雪】捅了【葉孤城】一刀 【西門吹雪】砍了【葉孤城】一刀 ********************* 【葉孤城】捅了【西門吹雪】一刀 【葉孤城】吃了一口藥,增長10滴血 ********************* 西門吹雪還剩下40的血量 葉孤城還剩下10的血量 ********************* 【西門吹雪】捅了【葉孤城】一刀 【西門吹雪】砍了【葉孤城】一刀 ********************* 【葉孤城】捅了【西門吹雪】一刀 【葉孤城】吃了一口藥,增長10滴血 ********************* 西門吹雪還剩下30的血量 葉孤城還剩下-5的血量 """ 複製代碼
class Fruit:
def __init__(self,name,color): self.name = name self.color = color def showColor(self): print('%s的顏色爲%s'%(self.name,self.color)) apple = Fruit('蘋果','紅色').showColor() orange = Fruit('橘子','黃色').showColor() watermelen = Fruit('西瓜','綠色').showColor() 複製代碼
class CkeckSelf:
def __str__(self): print(id(self)) pass CkeckSelf().__str__() selfObj = CkeckSelf() print(id(selfObj)) 複製代碼
class Animal:
def __init__(self, color, name, age): self.color = color self.name = name self.age = age def run(self): print('%s在跑步'%(self.name)) pass def eat(self): print('%s在吃東西' %(self.name)) pass def __str__(self): return '%s歲的%s的%s'%(self.age,self.color,self.name) cat = Animal('黑色','小貓',2) dog = Animal('白色','小狗',3) cat.run() dog.run() print(cat) print(dog) """ 小貓在跑步 小狗在跑步 2歲的黑色的小貓 3歲的白色的小狗 """ 複製代碼
1、顯示全部學生信息
2、新建學生信息 3、查詢學生信息 4、修改學生信息 5、刪除學生信息 0、退出系統 複製代碼
student_data = [
{ 'id': 123456, 'name': 'Tom', 'sex': '男', 'address': '迪士尼' }, { 'id': 123457, 'name': 'Jerry', 'sex': '女', 'address': '倫敦' }, ] 複製代碼
def beauty_list(datas):
for index, student in enumerate(datas): print(f'序號:{index}', end="t") print(f'姓名:{student["name"]}', end="t") print(f'性別:{student["sex"]}', end="t") print(f'地址:{student["address"]}') 複製代碼
def input_name():
while True: name = input('輸入名字:').strip() if name: return name else: continue 複製代碼
def choose_sex():
print('1(男) | 2(女)') n = input('選擇性別') if n == '1': return '男' else: return '女' 複製代碼
def show_all():
beauty_list(student_data) 複製代碼
def create_student():
sid = random.randint(1000, 10000) name = input_name() sex = choose_sex() address = input('地址:') student = { 'id': sid, 'name': name, 'sex': sex, 'address': address } student_data.append(student) 複製代碼
def find_student():
name = input_name() for i in student_data: if i['name'] == name: print(i) return else: print('無該學生任何信息') 複製代碼
def edit_student():
name = input_name() for student in student_data: if student['name'] == name: print(student) student['name'] = input_name() student['sex'] = choose_sex() student['address'] = input('地址:') return else: print('查無此人') 複製代碼
def delete_student():
name = input_name() for student in student_data: if student['name'] == name: student_data.remove(student) return else: print('查無此人') while True: print(''' ******************** 歡迎使用學生管理系統 一、顯示全部學生信息 二、新建學生信息 三、查詢學生信息 四、修改學生信息 五、刪除學生信息 0、退出系統 ******************** ''' ) op = input('請輸入序號:') if op == '1': print(student_data) show_all() elif op == '2': create_student() elif op == '3': find_student() elif op == '4': edit_student() elif op == '5': delete_student() else: print('退出系統') break 複製代碼
本文使用 mdnice 排版編程
原創:叫我詹躲躲 來源:掘金 連接:juejin.im/post/5f05e1…json