python3.0j基语法-01
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python基础语法,字符编码,python解释器在加载 .py 文件中的代码时,会对内容进行编码(默认ascill)
print("Hello word")
一个简单hello word输出
name = “kevm”
name2 = name
print ("my name is ",name,name2)
简单的一个变量输出,在开发程序里,没有标准的输入,但是必须有标准的输出,
多行注释,标准格式化输出放有三种,分别如下
name = input( "name :") #输入
age = int(input("age:")) #输入 #强制把字符串转换成整数
print(type(age) , type ( str (age) )) #强制整形转换字符串
#type( str (age)) #转换成正兴
job = input("job: ") #输入
info = ‘‘‘
=================info of %s ===============
Name:%s
Age:%d
Job:%s
‘‘‘ % (name,name,age,job)
print(info)
‘‘‘第一种格式化输出‘‘‘
#定义模块输出
#%s整数检测
#%d帮助检查数据类型
#%f 检测浮点
#格式化输出
‘‘‘
%% 百分号标记 #就是输出一个%
%c 字符及其ASCII码
%s 字符串
%d 有符号整数(十进制)
%u 无符号整数(十进制)
%o 无符号整数(八进制)
%x 无符号整数(十六进制)
%X 无符号整数(十六进制大写字符)
%e 浮点数字(科学计数法)
%E 浮点数字(科学计数法,用E代替e)
%f 浮点数字(用小数点符号)
%g 浮点数字(根据值的大小采用%e或%f)
%G 浮点数字(类似于%g)
%p 指针(用十六进制打印值的内存地址)
%n 存储输出字符的数量放进参数列表的下一个变量中
‘‘‘
info2 = ‘‘‘
=================info of {_name} ===============
Name:{_name}
Age:{_age}
Job:{_job}
‘‘‘ .format ( _name=name,
_age=age,
_job=job )
print(info2)
‘‘‘第二种格式化输出‘‘‘
info3 = ‘‘‘
================info of {0}===============
Name:{0}
Age:{1}
Job:{2}
‘‘‘ .format(name,age,job)
print(info3)
‘‘‘第三种格式化输出‘‘‘
输出结果如下
================================================================================
D:\Python35\python.exe D:/项目开发/pady01/pady01/name_user.py
name :ke
age:34
<class ‘int‘> <class ‘str‘>
job: sdfw
=================info of ke =============== #第一种格式化输出
Name:ke
Age:34
Job:sdfw
=================info of ke =============== #第二种格式化输出
Name:ke
Age:34
Job:sdfw
================info of ke=============== #第三种格式化输出
Name:ke
Age:34
Job:sdfw
*//常用的是最上面两个格式化输出,第三种格式化输出比建议使用//*
name = input("username:") #输入
#password = getpass.getpass("password:") #这个模式在python的GUI才能实现输入
password = input("password:") #这个password在pytharm开发工具里可以使用
print( name,password) #标准的答应输出
========================================================
import getpass
_username = ‘kevm‘
_password = ‘123456‘
username = input("username: ")
#password = getpass.getpass("Password: ")
password = input("Password: ")
#password = input("Password:")
#if _username == username and _password == password:
# print("Welcome user {name} login...".format(name=username))
#else:
# print("Invalid username Password")
if _username == username and _password == password:
print("Welcome user {name} login ...".format(name=username))
else:
print("Invalid username or password",password)
一个简单的用户登录时,输错密码三次,提示账户被锁定,要求找管理解锁
while循环
count = 0 #count 等于0
while True: #在while条件成为真的情况下,会不停一直循环,
print("count:",count) #打印输出没循环一次的count值
count = count +1 #count +=1 #每次加一
if count == 1000: #等到count值是1000的时候,就会停止无限循环
break #break 是终止循环,
=========================================================================================
age_of_oldboy = 56 #
#guess = int(input( "guess age:"))
while True: #while循环,规定次数
if conut ==3:
break
guess_age = int(input("guess age:"))
if guess_age == age_of_oldboy:
print("yes, you got it.")
break
elif guess_age > age_of_oldboy:
print("think smailer....")
else:
print("think bigger!...")
conut +=1
for i in range(3): #for循环规定制定次数循环
guess_age = int(input("guess age:"))
if guess_age == age_of_oldboy:
print("yes, you got it.")
break
elif guess_age > age_of_oldboy:
print("think smailer....")
else:
print("think bigger!...")
#正常走完上面的代码才会执行下面代码
else:
print("you have tried tooo many times .. fuck off")
===================================================================================================
任性猜年龄
age_of_oldboy = 56
count = 0
while count <3:
guess_age = int(input("guess age:"))
if guess_age == age_of_oldboy:
print("yes, you got it.")
break
elif guess_age > age_of_oldboy:
print("think smailer....")
else:
print("think bigger!...")
count +=1
if count == 3: #添加了一个if判断,你是需要继续玩下去,如果要玩下去,回车键,不先想玩下去,选择输入n结束
countine_confirm = input("do you want to keep guessing ...?")
if countine_confirm !=‘n‘:
count =0
else: #有了if判断,eles就不需要了
print("you have tried tooo many times .. fuck off")
===========================================================================================================================================================================================
for i in range(0,10,2):
print("loop ",i)
#输出双数,跳一个打印输出一个,python里默认是1,
=========================================================================================================================================================================================
for i in range(0,10): #打印输出三次,停止for循环输出
if i <3:
print( "loop ", i)
else:
continue #continue是继续
print("hehe!!")
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
for i in range(10): #for循环中for,可以添加多个for循环,
print(‘...............‘,i)
for j in range(10):
print(j)
if j >5: #if判断5大于就会停止for循环,
break #结束当前的for,bareak
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