執行首個程式hello_world.py
#_*_coding:utf-8_*_print("Hello world!")
輸出結果:
Hello world!
變數
#_*_coding:utf-8_*_name = "beyoungt"
#_*_coding:utf-8_*_name = "beyoungt"print(name) name = “abby"print(name)
輸出結果:
beyoungt abby
在程式中可隨時修改變數的值,python將始終記錄變數的最新值。
字串:
python中,用引號括起來的都是字串。可以是單引號也可以是雙引號。
"This is a string."'This is also a string.'
name = "beyoungt"print(name.title())
Beyoungt
upper():將字串全部改為大寫。
lower():將字串全部改為小寫。 字串的拼接:
first_name = "tian"last_name = "beyoungt"full_name = first_name + " " + last_nameprint("Hello," + full_name.title+" ! " )
Hello,Tian Beyoungt!
字串的格式化輸出:
name = “beyoungt"print("my name is %s" %name)#输出:my name is beyoungt
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)
新增製表符: \t#新增換行符號: \n##print("Languages:\n\tPython\nC\n\tJavaScript")
输出:
Languages:
Python
C
JavaScript
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
#!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!")
循環:
#!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
#!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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