Summary of Python basic operations

• Variable naming

Variable names can only be a combination of letters, numbers or underscores

The first character of the variable name cannot be a number

You cannot use some reserved keywords, such as and, as, assert, break, etc.

Officially recommended method name_of_BF

Python There is no constant statement, it is recommended to express constants in all uppercase letters

• Characters

## Development History: ASCII - > GB2312 -> GBK1.0 -> GB18030 (PC must support , General mobile phones only support GB2312) -> UNICODE (Two bytes for all identifiers) -> UTF-8 (Variable length encoding, one byte for English, three bytes for Chinese)

Python2.X Does not support Chinese characters, you need to declare the character set first

##Python3.X Direct supportUNICODE, so you can directly use Chinese

• Comment

  Comment Multi-line: Three single quotes

• #Console input

  ##username
=

("username:")

password=input("password:")

##Python 2.x raw_input Equivalent to 3.x input

#input in ##2.x , will be regarded as the input format, so try not to use For example: when entering

will find the variable ## of alex #Input in 3.x,

will be treated as STRING

• ##Console output

  Print multiple lines: three single quotes

  '''

##String concatenation

• info='''name:'''

  +
username

'''password:'''+passwordinfo2 ='''

name:{_name}##password:{_password}

'''

_name=username

_password=password)

info3='''

name:%s

password:%d

'''%(username,password)

##info4 ='''

name:{0}

.format(username,password)

The official recommendation is to use the second one

• password protection

getpass

input( "username:")##password=getpass.getpass(

)

Note:

PYCHARM . CMD里中用PYTHON好用

• ##judge

  if
guess_age==

:print (

)

elif guess_age>_age_of_jason:

##print(" thinksmaller...")

#else:

("thinkbigger...")

##Python Forces indentation, so no closing character is required

• cycle

whileTrue

guess_age=

(input("Jason'sage:"))##ifguess_age==_age_of_jason:

print(

)##break

elifguess_age>_age_of_jason:

print("thinksmaller..."

elifguess_age<_age_of_jason:

print( "thinkbigger..."

##counter=counter+1

ifcounter==3:

print("nochanceanymore...")

break

whilecounter<3:

guess_age=int(input("Jason'sage:"))

if guess_age==_age_of_jason:

print("bingo")

break

elifguess_age>_age_of_jason:

print("thinksmaller...")

elifguess_age<_age_of_jason:

print("thinkbigger...")

counter=counter+1

else:

print("triedtoomanytimes,fuckoff")

for i in range(0,3):

guess_age=int(input("Jason'sage:"))

if guess_age==_age_of_jason:

print("bingo")

break

elif guess_age>_age_of_jason:

print("thinksmaller...")

elif guess_age<_age_of_jason:

print("thinkbigger...")

else:

print("triedtoomanytimes")

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