python小白学习之路--01

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发布于 2020-01-14 15:10:27

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发布于 2020-01-14 15:10:27

文章被收录于专栏：python3python3

为了坚持而坚持（这话说了自己不信）作为一个不懂编程的桌面，在技术的路上越走越远，严重到了找工作都很难的阶段，很心酸。。。作为一个干啥啥不行，吃啥啥有够，韩剧看不够，年纪又不小的我来说，在进步很难，不知路又走到哪就跑偏了，为了找到好工作而学习，至少希望可以升级做个小运维也是很满足的。没有野心的人，想在现在生存，比有野心的人还要艰难。知足没有常乐，知足只是在后退而已！网上学习python 对于我这样没组织没纪律的人，貌似起不到神马作用，忽略我没钱报培训班，还是硬着头皮，希望靠着大神的视频让我有所进步吧！视频中python 入门第一篇结束后，要求写博客，我是假装听老师的话，然后过来自我安慰。没啥语言功底，数学一般逻辑性不强，字迹潦潦草草，写出的东西也只有自己能看。 python01 小白入门的第一天了解python，神马是python，是蟒蛇。为啥python要用.py 结尾，为了让其他人知道你写的这是个python 脚本,老师推荐最好使用pycharm脚本编辑器，下了个试用版，免费使用30天。 python 版本 3.6 （最好学习使用3.0 版本，2.0 过时了）

字符编码 ASCII 编码

输出“Hello world” (这是个仪式）变量名要求：a, 不能是数字开头 b，除了“_”以外不能包含其他特殊字符 c，包含大小写，数字，下划线 d，变量名要简单易懂表达所代表的东西 e，关键字不能成为变量名（and ,as,assert break class continue def del elif ………..）

定义变量 name = "Hello World" print (name)

2.注释多行：（''' '''） ''' 多行注释，也可以打印多行 ''' 打印多行：例： name = 'alex' msg=''' print ("my name is :" , {_name} ) name = "paoche ge" '''.format(_name=name) print (msg) 输出结果： print ("my name is :" , alex ) name = "paoche ge"

3.用户输入（input）和格式化输出例：用户输入（input） username = input("type your username:") print(username) 格式化输出 a,例：字符串拼接(''' + ''') username = input ("username is :") age = input("age is :") job = input("job is:") salary=input("salary is:") info1=''' ------info1 is ''' + username '''----------- username is : '''+ username ''' age is : ''' +age ''' job is : '''+job ''' salary is : ''' + salary print (info1)

b, 字符串拼接(''' %s ''') ,s= string 字符串 username = input ("username is :") age = input("age is :") job = input("job is:") salary=input("salary is:") info2=''' ------info2 is %s----------- username is : %s age is : %s job is : %s salary is : %s '''%(username,username,age,job,salary) print (info2)

c, 字符串拼接(''' %s ''') s= string %d=整数 int=强制为数字？ username = input ("username is :") age = int(input("age is :")) job = input("job is:") salary=input("salary is:") info3=''' ------info3 is %s----------- username is : %s age is : %d job is : %s salary is : %s '''%(username,username,age,job,salary) print (info3)

d, 字符串拼接（使用排序.format） username = input ("username is :") age = input("age is :") job = input("job is:") salary=input("salary is:") info4=''' ------info4 is {0}----------- username is : {0} age is : {1} job is : {2} salary is : {3} '''.format(username,age,job,salary) print (info4)

e, 字符串拼接(.format) username = input ("username is :") age = input("age is :") job = input("job is:") salary=input("salary is:") info5=''' ------info5 is {_username}----------- username is : {_username} age is : {_age} job is : {_job} salary is : {_salary} '''.format(username=_username, age=_age, job=_job, salary=_salary) print (info5)

以上的输出（print）结果是:

**/Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6 "/Users/a1/PycharmProjects/untitled3/day1/user input.py" username is :alex your job is:IT your age is:23 salary is :232323

--------info 5 alex------ yourname is :alex your job is :IT your age is :23 your salary is :232323 **

4.密码加密例： username = input("username:") password = getpass.getpass("password:") print (username,password)

5.if 条件判断语句（）例： oldboy_age=55 age = input("guess oldboy age is :")

if oldboy_age == age print("yes,you got it") else print("wrong ansser")

例：使用and 或是 or 连接符，满足条件才执行 username = 'alex'（错误的写法为 usename=alex ，表示是变量） password = '123456' _username =input("please input your name:") _pass=input("please input your password:") if usename=_username and _pass=password: print ("welcom login system") else: print("wrong user")

while 循环语句 while True 循环语句：表示为真则执行，反之则执行else 语句例： count = 0 while True: print ("count:",count) count = count +1 # count +=1 每次循环加1，打印显示循环后的数值

while True 和 if 一起循环判断语句例： age= 55 while True: guess = int(input("guess age :")) if guess == age: print("yes,you got it.") elif guess < age: print("think older.") else: print ("think smaler") 输入结果如下 /Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6 "/Users/a1/PycharmProjects/untitled3/day1/whiel True 循环.py" guess age :34 think older. guess age :56 think smaler guess age :

加上条件：使用户最多可以猜错三次条件或是while 加条件语句如（while count < 3 ）定义计数器 count = 0, count += 1 每次循环+1 跳出循环break 例： age= 55 count = 0 while True: if count == 3: break guess = int(input("guess age :")) if guess == age: print("yes,you got it.") elif guess < age: print("think older.") else: print ("think smaler") count += 1 执行的结果为： /Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6 "/Users/a1/PycharmProjects/untitled3/day1/whiel True 循环.py" guess age :23 think older. guess age :23 think older. guess age :23 think older.

Process finished with exit code 0

对以上的代码做优化 例： age = 55 count = 0 while count < 3: guess = int(input("guess age: ")) if age == guess: print ("yes ,you got it") elif age < guess: print ("think older") else: print ("think smaller") count += 1

** # if count == 3:

print ("you have try too many times.")**

else: print("you have try too many times.") 输出结果是： /Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6 "/Users/a1/PycharmProjects/untitled3/day1/whiel True 循环.py" guess age: 34 think smaller guess age: 35 think smaller guess age: 78 think older you have try too many times.

Process finished with exit code 0

6.for 循环 a,#最基本的for 循环 for i in range(10): print(i) 输出结果： 0 1 2 3 4 5 6 7 8 9

b,显示不连续的数字(0:从0 开始，10:循环10次，2:每隔2位输出一个数字) for i in range(0,10,2): print (i) 输出结果为： /Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6 "/Users/a1/PycharmProjects/untitled3/day1/for 循环.py" 0 2 4 6 8 Process finished with exit code 0 c，使用for 循环猜年龄例： age = 55 for i in range (3): guess = int(input("guess age:")) if guess == age: print ("yes,you got it .") break elif guess < age: print ("think older") else: print ("think smaller") else: print("you have trid too many times.") 输出结果： /Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6 "/Users/a1/PycharmProjects/untitled3/day1/for 循环.py" guess age:34 think older guess age:34 think older guess age:34 think older you have trid too many times. Process finished with exit code 0

6.continue #跳出本次循环，执行下一次循环 while True: for i in range(3): user = int(input("guess age:")) if user == age: print("1") elif user > age: print(">") elif user < age: print("<") con = input("do you want con?")

if con == 'c':
    continue
else:
    break

age_of_oldboy = 55 count = 0 while count < 3: age = int(input("please input age of oldboy:"))

if age_of_oldboy == age:
    print("yes ,you got it!")
    break
elif age_of_oldboy < age:
    print("think smaller")
else:
    print("think older")
    count += 1

if count == 3:
    continue_confirm = input("do you want to keep guessing..?")
    if continue_confirm  != 'n':
        count = 0
        # != 不等于

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原始发表：2019-07-19 ，如有侵权请联系 cloudcommunity@tencent.com 删除

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