if_else_while_for

import getpass
#标准库里要加密密码需要导包getpass.但是getpass在pycharm中不好用,需要在命令窗口中输入才管用.

_username = "abc"
_password = "abc123"
username = input("username:")
# password = getpass.getpass("password:")
password = input("password:")

if _username==username and _password==password:
    print("Welcome user {name} login...".format(name=username))
else:
    print("invalid username or password")

age_of_oldboy = 56

guess_age = int(input("guess age:"))

if guess_age==age_of_oldboy:
    print("yes, you got it.")
elif guess_age>age_of_oldboy:
    print("think smaller")
else:
    print("think bigger")

age_of_oldboy = 56

count=0
while True:
    if count==3:
        break
    # print("count:",count)
    guess_age = int(input("guess age:"))

    if guess_age==age_of_oldboy:
        print("yes, you got it.")
        break
    elif guess_age>age_of_oldboy:
        print("think smaller")
    else:
        print("think bigger")
    count=count+1  #count+=1
if count==3:
    print("you have tried too many times! Fuck off!")


# 优化后的代码
while count<3:
    guess_age = int(input("guess age:"))

    if guess_age==age_of_oldboy:
        print("yes, you got it.")
        break
    elif guess_age>age_of_oldboy:
        print("think smaller")
    else:
        print("think bigger")
    count=count+1  #count+=1
else:
    print("you have tried too many times! Fuck off!")

'''
while循环实现
age_of_oldboy = 56

count=0
while True:
    if count==3:
        break
    # print("count:",count)
    guess_age = int(input("guess age:"))

    if guess_age==age_of_oldboy:
        print("yes, you got it.")
        break
    elif guess_age>age_of_oldboy:
        print("think smaller")
    else:
        print("think bigger")
    count=count+1  #count+=1
if count==3:
    print("you have tried too many times! Fuck off!")


# 优化后的代码
while count<3:
    guess_age = int(input("guess age:"))

    if guess_age==age_of_oldboy:
        print("yes, you got it.")
        break
    elif guess_age>age_of_oldboy:
        print("think smaller")
    else:
        print("think bigger")
    count=count+1  #count+=1
else:
    print("you have tried too many times! Fuck off!")

'''
'''
for i in range(10):   #range10其实是从0到9.
    print("loop", i)
'''

# for循环来实现
age_of_oldboy = 56
for i in range(3):
    guess_age = int(input("guess age:"))
    if guess_age == age_of_oldboy:
        print("yes, you got it")
        break
    elif guess_age > age_of_oldboy:
        print("think smaller")
    else:
        print("think bigger")
else:
    print("you have tried too many times.. fuck off!")

# 0到9的数字,隔一个打印一个到控制台
for i in range(0,10,2):   #括号中的2是步长,不写的话默认是1.若想隔两个打印一uqw,则步长设置为3即可.即for i in range(0,10,3)
    print("loop", i)

# 每错三次不直接跳出,而是问玩家是否要继续
age_of_oldboy = 56

count=0
while True:
    if count==3:
        break
    # print("count:",count)
    guess_age = int(input("guess age:"))

    if guess_age==age_of_oldboy:
        print("yes, you got it.")
        break
    elif guess_age>age_of_oldboy:
        print("think smaller")
    else:
        print("think bigger")
    count=count+1  #count+=1
    if count==3:
        continue_confirm = input('do you want to continue?')
        if continue_confirm !='n':
            count=0
else:
    print("you have tried too many times! Fuck off!")

# continue的用法: 跳出本次循环,继续下一次循环
for i in range(0,10):
    if i<5:
        print("loop", i)
    else:
        continue  #跳出本次循环,继续下一次循环
    print("hehe...")

#break:结束当前循环
for i in range(10):
    print("-----------------",i)
    for j in range(10):
        print(j)
        if j>5:
            break