一、如何实现输入密码时不可见？
import getpass
pwd= getpass.getpass(“请输入密码：")
（pycharm内可能不可用）
二、if.....else
age=25
guess_age = int(input(‘你猜我多少岁？‘)) #python3.X 中input的是一个str，需要int（）
if guess_age == age:
print(‘Yes,you got it!‘)
elif guess_age > age:
print(‘think smaller‘)
else :
print(‘think bigger‘)
三、while
count = 0
while True：
print（‘count：’，count）
count = count +1
#guess age
age=25
count = 0
while count < 3:
guess_age = int(input(‘你猜我多少岁？‘))
if guess_age == age:
print(‘Yes,you got it!‘)
elif guess_age > age:
print(‘think smaller‘)
else :
print(‘think bigger‘)
count +=1
if count ==3:
continue_confirm = input(‘Do you want to continue?‘:)
if continue_confirm != "n":
count = 0
#else:
# print(‘you have try too many times‘)
三、for循环
for i range(10):
print（”loop:“,i）
for i range(0,10,3):#从0开始，到10结束，步长为3
print（”loop:“,i）
#guess age
age=25
count = 0
for i in range(3):
guess_age = int(input(‘你猜我多少岁？‘))
if guess_age == age:
print(‘Yes,you got it!‘)
elif guess_age > age:
print(‘think smaller‘)
else :
print(‘think bigger‘)
count +=1
else:
print(‘you have try too many times‘)
#! usr/bin/env python# encoding:utf-8# __author__="Macal"‘‘‘for i in range(0,10): if i < 5: print("loop",i) else: continue print(‘hehe‘)‘‘‘for i in range(10): print(‘----------‘, i) for j in range(10): print(j) if j > 5: break #结束当前循环