python3 format input and output

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One, the variable

1) Variable assignment method

 

2）

Quick assignment: ctrl+d

Variable substitution shortcut: ctrl+r

3) String concatenation

 

 

Second, input-output

1 input

1) String output:

　　    

 

In this case, the output is all characters, and it is output as it is

 

2) Integer output

Add the evil() function:

　　　　

In this case, the integer type can be output and can be operated. However, non-numeric characters such as letters cannot be entered, otherwise an error will be reported.

 2 outputs

1) Format the output

2) Multiple variable output

3) output to a file

The program opens a file and operates on it accordingly. where w refers to writable

4) The output does not wrap automatically

The result is not wrapped:

5) Output each data, use the separator to separate

result:

6) flush use

result:

After 5s hibernation, the following content appears

 

 After adding flush, the program will not sleep and execute immediately:

7) name() use

　　

The last one is the use of the name method, which can be called the dictionary lookup method

8) width() use

Result: five places in total, right-aligned

 

Add "-" between %5d to align left:

Add a space (no matter how many) between %5d, and there is a space to the left, in order to align with negative numbers:

 

9) Number 0 padding using

If the display time is 04:08:

result:

 

 It needs to be added between %d as follows:

result:

 

 

 

 

10) Precision printing

result:

 

result:

 

 

result:

 

result:

 

 

result:

 

11) Binary output and scientific notation output

binary:

　　　　　　　　　　　　　　result:

Octal:

　　　　　　　　　　　　　　result:

Hex:

　　　　　　　　　　　　　　　result:

 

Scientific notation output:

　　　　　　　　　　　  result:

 

　　　　　　　　　　　　result:

 

 

 

　

 

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