Basic Python knowledge and basic python tutorials

Basic Python knowledge and basic python tutorials

Python loop, if you already have programming experience, these are all trivial for you.

Names = ["Zhang San", "Li Si", "Wang Wu"] for name in names: print (name)

Python loops include not only the For loop, but also the While loop.

n=99while n>0:    n=n-1    print(n)

 

I will not display the display results because it is too troublesome to take screenshots and Import images.

How to Use Dict and Set

Dict operates through key-value pairs like JSON

Read content in Dict

Dics = {"a": "Zhang San", "B": "Li Si", "c": "Wang Wu"} print (dics ["a"])

 

Dics = {"a": "John", "B": "Lee"} print (dics. get (""))

Deletes an element of Dict.

Dicts = {"a": "John", "B": "Lee"} dicts. pop ("")

Similar to dict, set is also a set of keys, but does not store values. Because keys cannot be repeated, there are no duplicate keys in the set.

>>>st=set([1,2,3,4])>>>st{1,2,3,4}

Add set

St. add (5)

If the same element is added, the filter is performed.

St. add (4)

Show {1, 2, 3, 4}

Set deletes an element.

St = set ([1, 2, 4])

St. remove (1)

{2, 3, 4}

List Sort

>>> A = [,]

>>> A. sort ()

[,]