must master

1. Digital

int（...）

2. String

replace/find/join/startswith/endswith/split/upper/ower/format

3. List

append/entend/insert

Index, slice, loop

4. Tuple

Index, slice, loop

First-level elements cannot be modified, added or deleted

5. Dictionary

get/update/keys/values/items

for loop, index

in(key)

6. Boolean value

bool(...) conversion

false: None, "" (empty string), [] (empty list), () (empty tuple), {} (empty dictionary), 0