四个python小练习

<pre class="brush:python;gutter:true;">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)