运行首个程序hello_world.py
#_*_coding:utf-8_*_print("Hello world!")输出结果：
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Hello world!
变量
#_*_coding:utf-8_*_name = "beyoungt"
#_*_coding:utf-8_*_name = "beyoungt"print(name) name = “abby"print(name)
输出结果：
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beyoungt abby
在程序中可随时修改变量的值，python将始终记录变量的最新值。
字符串:
python中，用引号括起来的都是字符串。可以是单引号也可以是双引号。
"This is a string."'This is also a string.'
使用方法修改字符串大小写：
name = "beyoungt"print(name.title())
输出：
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Beyoungt
title():将每个单词首字母改为大写。
upper():将字符串全部改为大写。
lower():将字符串全部改为小写。
字符串的拼接：
first_name = "tian"last_name = "beyoungt"full_name = first_name + " " + last_nameprint("Hello," + full_name.title+" ! " )输出：
Hello，Tian Beyoungt!
字符串的格式化输出:
name = “beyoungt"print("my name is %s" %name)#输出：my name is beyoungt%s:字符串 %d:整数 %f:浮点数
name = input("name:")
age = int(input("age:") ) #integerjob = input("job:")
salary = input("salary:")
info = '''-------- info of %s -----
Name:%s
Age:%d
Job:%s
Salary:%s''' % (name,name,age,job,salary)
info2 = '''-------- info of {_name} -----
Name:{_name}
Age:{_age}
Job:{_job}
Salary:{_salary}'''.format(_name=name,
_age=age,
_job=job,
_salary=salary)
info3 = '''-------- info of {0} -----
Name:{0}
Age:{1}
Job:{2}
Salary:{3}'''.format(name,age,job,salary)print(info3)添加制表符: \t
添加换行符: \n
print("Languages:\n\tPython\nC\n\tJavaScript")
输出：
Languages:
Python
C
JavaScript删除空白:
favorite_language = " python "favorite_language.rstrip() #删除末尾空白favorite_language.lstrip() #删除开头空白favorite_language.strip() #删除两端空白
模块:
#！usr/bin/env python#-*- coding:utf-8-*-# Author burnywenimport getpass
_username = 'burnywen'_password = '123456'username = input("username:")#password = getpass.getpass("password:") #fails to work well in pycharm;password = input("password:")if _username == username and _password == password:print("Welcome user {name} login...".format(name=username))else:print("Invalid username or password!")getpass模块使密码隐藏。
循环：
#！usr/bin/env python#-*- coding:utf-8-*-# Author burnywencount = 0while True:print("count:",count)
count +=1if count == 100:break#！usr/bin/env python#-*- coding:utf-8-*-# Author burnywenfor i in range(0,10):if i <3:print("loop ",i)else :continueprint("oh....")
#！usr/bin/env python#-*- coding:utf-8-*-# Author burnywenfor i in range(10):print('----------',i)for j in range(10):print(j)if j >5:breakguess小游戏及改进:
#！usr/bin/env python
#-*- coding:utf-8-*-
# Author burnywen
age_of_burnywen = 23for i in range(3):
guess_age = int(input("guess age:") )if guess_age == age_of_burnywen :print("congratulations, you are right. ")breakelif guess_age > age_of_burnywen:print("think smaller...")else:print("think bigger...")else:print("you have tried too many times.")
#！usr/bin/env python#-*- coding:utf-8-*-# Author burnywen
age_of_burnywen = 23count = 0while count <3:
guess_age = int(input("guess age:") )if guess_age == age_of_burnywen :print("congratulations, you are ringht. ")breakelif guess_age > age_of_burnywen:print("think smaller...")else:print("think bigger!")
count +=1else:print("you have tried too many times.")
#！usr/bin/env python#-*- coding:utf-8-*-# Author burnywenage_of_buruywen =23count = 0while count <3:
guess_age = int(input("guess age:") )if guess_age == age_of_burnywen :print("congratulations, you are right. ")breakelif guess_age > age_of_burnywen:print("think smaller...")else:print("think bigger!")
count +=1if count == 3:
countine_confirm = input("do you want to keep guessing..?")if countine_confirm != 'n':
count =0else:print("you have tried too many times.")
