Python list-generated, list-derived

By using the List Builder, you can quickly generate a list that can derive another list from a list, while the code is very concise.

format [x for x in content][x for x in content if condition]

1: To put the generated element x in front, execution, the first to execute the later for loop

2: You can have multiple for loops followed by a For loop, or you can add an if condition after the for loop

The 3:for loop can be followed by any iterator (tuple, list, generator) in any way. ) As long as there is a value in the object that can iterate.

1: Single-loop list generation

String Generation List

print ([x for X in ' ABCD ']) #[' A ', ' B ', ' C ', ' d ']

List Generation List

print ([x for X in range (10)]) #[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

List Build list if condition

print ([x for x in range] if x > 5]) #[6, 7, 8, 9]

2: Double-loop list generation

Print ([M + N for m in ' ABC ' for n ' XYZ ') "#[' AX ', ' AY ', ' AZ ', ' BX ', ' by ', ' BZ ', ' CX ', ' CY ', ' CZ ']

See document: List Generation--Teacher Liao's Blog

Python list-generated, list-derived