第一章python入门

一、第一个程序

1、helloWorld

print("hello world")

 2、最简单的可执行的python文件

linux命令行下：

vim hello.py

 hello.py文件中插入如下代码：

#!/use/bin/env python
print("hello,World")

 执行：./hello.py 即可。

ps：执行前要给予hello.py执行权限，chmod 755 hello.py

3、python格式化输出

输入信息

name = input('username:')
age = int(input("age:"))#integer
job = input("job:")
print(type(age))

 第一种（内存消耗大不建议使用）

info1 = '''
-------- info of '''+name+''' ---
name:'''+name+'''
Age:'''+age+'''
job:'''+job+'''
'''

print(info1)

 

 第二种

info2 = '''
-------- info of %s ---
name:%s
Age:%d
job:%s
'''%(name,name,age,job)

print(info2)

 

 第三种

info3 = '''
-------- info of {_name} ---
name:{_name}
Age:{_age}
job:{_job}
'''.format(_name=name,_age=age,_job=job)

print(info3)

 

第四种

info4 = '''
-------- info of {0} ---
name:{0}
Age:{1}
job:{2}
'''.format(name,age,job)

print(info4)

 

 4、条件语句

age_of_oldboy =56
guess_age = int(input("guess age:"))

if guess_age == age_of_oldboy :
    print("you got it.")
    break
elif guess_age >age_of_oldboy :
    print("think smaller")
else :
    print("think biger")

 5、循环语句

while循环

age_of_oldboy =56
count =0
while count<3:
    guess_age = int(input("guess age:"))

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

 for循环

for i in range(0,10,2):
    print("loop ",i)