def even_print():

    for i in range(1,101):

        if i % 2 == 0:

            print (i)

even_print()

#列表解析式的方式：

k = [n for n in range(1,101) if n%2 == 0]

print (k)

def text_creation():

    path = 'C:/Users/Administrator/Desktop'

    for name in range (1,11):

        with open(path + str(name) + '.txt','w') as text:

            text.write(str(name))

            text.close()

            print ('done')

text_creation()

def invest(amount,rate,time):

    print('principal amount:{}'.format(amount))

    for t in range(1,time + 1):

        amount = amount * (1 + rate)

        print ('year {}: ${}'.format(t,amount))

invest(100,.05,8)

invest(2000,.025,5)

import random

checkcode = ''

for i in range(4):

    current = random.randrange(0,4)

    if current != i:

        temp = chr(random.randint(65,90))

    else:

        temp = random.randint(0,9)

    checkcode += str(temp)

print (checkcode)

C:\Users\Administrator\AppData\Local\Programs\Python\Python35\python.exe D:/python3/shenqiankaobei.py

22U3