day1我學會了什麼？

   之前都是本身自學python沒有老師的講解沒有同窗們一塊兒學習的氛圍，本身的進展很慢。

經過第一天認真的聽講，使我對基礎部分記憶的更加的深入了。

做業：

求一百之內的和：

# -*- coding:utf-8 -*-
sum = 0

count = 1
while count < 101:
    sum = sum + count
    count = count + 1
print(sum)
一百之內的奇數：

# -*- coding:utf-8 -*-
count = 0
while True:
    if count == 100:
        break
    count = count + 1
    if 0 != count % 2:
        print(count)
一百之內的偶數：

# -*- coding:utf-8 -*-
count = 1
while count < 101:
    div = count % 2
    if div == 0:
        print(count)
    else:
        pass
    count = count + 1
求1-2+3-4+5 ... 99的全部數的和：

# -*- coding:utf-8 -*-
count = 1
sum = 0
while count < 100:
    div = count % 2
    if div == 1:
        sum = sum + count
    else:
        sum = sum - count
    count = count + 1
print(sum)
用戶登陸（三次錯誤機會）：

# -*- coding:utf-8 -*-counts = 0user_list =  [{'username':'jack', 'password':'123456' },{'username':'tom', 'password':'123456'},              {'username':'jieru', 'password':'123456'},{'username':'xiaogang', 'password':'123456'},]flag = Falsefor item in user_list:    user = input("請輸入用戶名：")    passwd = input("請輸入密碼：")    if item['username'] == user and item['password'] == passwd:        flag = True        print("登陸成功")        break    else:        print("登陸失敗")        counts = counts + 1    if counts == 3:        print("您已經輸錯三次，不能再輸入了。")        break