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运行首个程序hello_world.py
#_*_coding:utf-8_*_print("Hello world!")
输出结果:
Hello world!
变量
#_*_coding:utf-8_*_name = "beyoungt"
#_*_coding:utf-8_*_name = "beyoungt"print(name) name = “abby"print(name)
输出结果:
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:
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:break
guess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.")
<br>
#!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.")
<br>
#!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.")
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