python小練習,打出1-100之間的所有偶數,設計一個函數,在桌面上創建10個文件,並以數字命名,復利計算函數


  練習一:打出1-100之間的所有偶數
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)

  

練習二:設計一個函數,在桌面上創建10個文件,並以數字命名

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()

 練習三:復利計算函數

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)

 練習四:隨機驗證碼:

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)

  執行結果:

C:\Users\Administrator\AppData\Local\Programs\Python\Python35\python.exe D:/python3/shenqiankaobei.py
22U3

  


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