摘要:
列表内置方法:只能给列表用 方法|代码 : |: 索引取值/索引修改值|lt[0] = 2 print(lt) 索引切片|print(lt[0:1]) 成员运算in/not in|print(2 in lt) print(2 not in lt) for循环|for i in lt:print(i) 阅读全文
摘要:
what is file? virtual unit offered by operation system steps to open file 1.find the file_path(file_path) 2.open file(open) 3.read or change the file( 阅读全文