basic

tony2099 included in python

2023-12-16 150 words One minute

Contents

variables

python：

动态类型
无需声明；
区分全局/局部变量：
1. function can access global , but can’t change it

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x = 100

def hello():
	y = 200

complex data types

iterators

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class MyRange:
    def __init__(self, start, end):
        self.start = start
        self.end = end

    def __iter__(self):
        self.current = self.start
        return self

    def __next__(self):
        if self.current >= self.end:
            raise StopIteration
        else:
            self.current += 1
            return self.current - 1

# Using the custom iterable
for number in MyRange(1, 5):
    print(number)

iterable: product iterator: reset the start iterator: access element sequentially

iterable object

list
tuple: immutable list
strings
set
dict
set

basci operation:

for loop

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for x in object


// 1. create a iterator 2. and do next

lenght
index and slice

list obsic

join two list
copy list
list ocmper