python笔录第一周

赋值打印，注释，各种循环语句

name = "您好，世界"
msg = "i'm alex li"

print(name)
print(msg)

#单行注释

"""
多行注释
"""

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三种输出方式：
一：
拼接方式，不推荐使用，每次都要开辟新内存

二：

info2 = '''
---- info of {_name}----
name:{_name}
age:{_age}
job:{_job}
salary:{_salary}
'''.format(_name = name,
           _age = age,
           _job = job,
           _salary = salary)
print(info2)

三：

info3 = '''
---- info of {0} ----
name:{0}
age:{1}
job:{2}
salary:{3}
'''.format(name, age, job, salary)
print(info3)

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条件判断：

import getpass

#密文导入框架（终端显示）

#存密码
_username = 'zhou'
_password = 'abc123'
username = input("username:")
#password = getpass.getpass("password:")
password = input("password:")


#if else逻辑
#else强制缩进
if _username == username and _password == password:
    #if的子代码
    print("welcome to user {name} python".format(name=username))
else:
    #else的子代码
    print("Invalid username or password!")

print("我的Tina")

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while循环：

count = 0
while True:
    print("count:", count)
    count = count + 1   #count += 1

    if count == 10 :
        break

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三次输入练习：

age_of_oldboy = 56;

count = 0
while count < 3:

    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...")
    count += 1
    print("count:", count)

else:
    print("对不起，您的次数已经使用完了")

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for循环打印：

#循环10次  range相当于变量的集合，一组数据 0-9

#打印0，2，4，6，8    0，10，2
#打印1，3，5，7，9    1，10，2

for i in range(0, 10, 3) :
    print("loop", i)

for i in range(10) :
    print("loop", i)

for循环的嵌套：

for i in range(4) :
    print("-------", i)
    for j in range(4) :
        print(j)
        if j > 1 :
            break

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