Python学习笔记 DAY9

is is operator 同一性运算符

变量不是一个盒子Variables are not boxes

浅拷贝和深拷贝Shallow and deep copy

列表推导式list comprehension expression

[expression for target in iterable]

[expression for target in iterable ifcondition]

[expression for target in iterable1

                    for target in iterable2

                   ···

                    for target in iterableN]

[expression for target in iterable1 if condition1

                    for target in iterable2 if condition2

                   ···

                    for target in iterableN if conditionN]

ord()将单个字符串转换成对应的编码