Python diary--writing python for the first time

"Hello World"    

1  # ! /usr/bin/env python2  #  -*-coding:utf-8-*-3  4      Print ('hello,world')

when the line stares: # is annotated content

Multiline Comment: "" "Annotated Content" ""

"Print user input user name and password"
     

1 a1 = Raw_int ("UserName")2 a2 = Getpass.getpass (" PassWord " )34Print(A1)5Print(A2)

[Ps:getpass.getpass Assigning user input to name variable] does not show password when input

"Writing and executing Python code flow grooming"1. Create a xxx.py file
PS: Do not have Chinese path
2. Write code
A. Two lines of the head specific
#!/usr/bin/env python (Specify editor path in Linux)
#-*-Conding:utf8-*-
B. Write function code
3. Execute code
A. Open the terminal
Path to the B.python code file

11. Create a xxx.py file2 PS: Do not have Chinese path32. Write Code4 A. Two lines of the head specific5         #!/usr/bin/env python (Specify editor path in Linux)6         #-*-Conding:utf8-*-7 B. Write function code83. Execute code9 A. Open the terminalTenPath to the B.python code file

"python variable"1.python2.7 is using "raw_input" to complete waiting for user input

• Example: 1 raw_input ('>>>')

python3.5 is using "input" to finish the place. User Input

• Example: 1 input ('>>>')

 PS: Variables are used to give specific ' things ' to the meaning--variable assignment2. Limitations in Variables

• Variable name: function with numbers, letters, underscores

Example: 1 a1 = ABC 2 A_BC = 123 Example: 1 name1 = "ABC" 2 name2 = name1 so name2 = " /c13>ABC"

• Cannot start with a number
• Variable cannot be a keyword inside python

        

PS: Write code in the IDE if you encounter an internal variable editor, you will be prompted

"Basic data Type"1. Number: 1234

• Example: 1 ABC = 1234

2. String:

• Cases:

  1 " ABC " 2 ' BCD ' 3 a3 =  "" "abc12 " ""

3. Boolean value:True/falsetrue 

• Data is true--a results
• Data is false--b result

     

Ps:true/false First Letter Capital

  "Basic conditional statement One"

1 if Condition:                      established                                                   2           content one 3           content two 4Else  :                           not set up 5           content 6           content four 7           

Ps: If Else statement Symbols written in English "=" An equal sign is an assignment "= =" Two equals is a comparison "! =" does not equal

   "Basic conditional statement two"   

1Name = Raw_input ("UserName") 2PWD = Raw_input ("PassWord") 3 ifName = ="ABC"  andPWD = ="123":4      Print('Yes')5 Else:6      Print('No')

  "Basic Conditional Statement three"--Multiple conditions comparison

1 if Condition One: 2           xxxx3elif  condition Two:4          xxxx5elif  Condition Three:6          xxxx7Else:8           AAAA       9

   "First real while loop" "First real while loop"While condition: code block Example:

1 imput Time 2        while True: 3               Print ('1') 4               TIME.SLOSP (1)5     print('end')

• Terminating a while loop with conditional statements

Basic Loop: Example:

1   n1 = True2while    N1:3        print(' 123 ' )4         n1 = False5   print('end ')

• Break: Used to jump out of the current loop, and the code below the break is not executing.
• Conttinue: Used to jump out of this loop and continue the next cycle

 

Python diary--writing python for the first time