四个python小练习
四个python小练习:
1、打印出1-100之间的所有偶数
<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)
2、设计一个函数,在桌面上创建10个文件,并以数字命名
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()
3、复利计算函数
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)
4、随机验证码
import randomcheckcode = ''
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)
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