入門一：python變量、獲取值、標准輸出、循環判斷語句

　　變量是由字母、數字和下划線組成的，數字不能作為開頭。

　　python中沒有常量，一般用常量的時候將變量名大寫就可以了，注意后面不要修改它的值。

　　變量命令：使用下划線分隔。

　　字符編碼在代碼開頭加入一行

# -*- coding:utf-8 -*-

獲取輸入的值input：

　　普通輸入： 

name = input("name:") 2 age = int(input("age:")) 3 job = input("job:") 4 salary = input("salary:")

　　密文輸如：

import getpass 2 
password = getpass.getpass("password:")

標准輸出的幾種方式：

　　第一種：

info2 = '''
-------------info of {_name}---------  3 Name:{_name}  4 Age:{_age}  5 Job:{_job}  6 Salary:{_salary}  7 '''.format(_name=name,  8            _age=age,  9            _job=job, 10            _salary=salary)

　　第二種：

info = '''
--------------------info 0f %s--------------- 3 Name:%s 4 Age:%d 5 Job:%s 6 Salary:%s 7 '''%(name,name,age,job,salary)

if-else循環

　　猜年齡：

age_of_oldboy = 56

guess_age = int(input("guess age:"))
if guess_age>age_of_oldboy:
    print("your guess is older.")
elif guess_age==age_of_oldboy:
    print("you are right!")
else:
    print("your guess is younger.")

 

 while循環

　　在猜年齡的基礎上控制只讓猜三次：

while count<3:
    guess_age = int(input("guess age:"))
    if guess_age>age_of_oldboy:
        print("your guess is older.")
    elif guess_age==age_of_oldboy:
        print("you are right!")
        break
    else:
        print("your guess is younger.")

    count = count + 1
    print("you have {_count} times.".format(_count=3-count))
#if count == 3:
else:
    print("sorry,you try too many times")

 

for循環：

##基礎格式
1 for i in range(1,10,2):
    print("loop ",i)

 

　　用for循環寫猜密碼：

age_of_oldboy = 56

for i in range(3):
    guess_age = int(input("guess age:"))
    if guess_age>age_of_oldboy:
        print("your guess is older.")
    elif guess_age==age_of_oldboy:
        print("you are right!")
        break
    else:
        print("your guess is younger.")

    print("you have {_count} times.".format(_count=2-i))
#if count == 3:
else:
    print("fuck")