python for 数据类型转换

1.set()  --- list()

s = {12,4,3,4}print(list(s))        # [3, 12, 4]

lst = [3, 12, 4]print(set(lst))       # {3, 12, 4}

tu = (1,2,3,4)print(list(tu))       #[1, 2, 3, 4]print(set(tu))        #{1, 2, 3, 4}

s = {1,2,3}print(tuple(s))       #(1, 2, 3)

tu = (1,2,3,4)print(str(tu))

lst = [1,2,3,4,[5,6,7,[8,9,10]]]print(str(lst))

print  #面向用户的s = str(lst)print(repr(s))

na = ‘alex‘lst = list(na)print(lst)

dic = {‘name‘:‘黑哥‘,‘age‘:18}lst = list(dic)   # 字典的键print(lst)

s = set(dic)print(s)

strintboollisttupledictset

print(bool(‘ ‘))  Trueprint(bool(‘‘))   False

print(bool(0))   Falseprint(bool(56))   True

print(bool(True))  Trueprint(bool(False)) False

print(bool([1,2,3])) Trueprint(bool([]))     # False

print(bool((1,2,3))) #Trueprint(bool(()))      #False

print(bool())

0 ‘‘ None [ ] ( ) { } { } False

print(bool(None))

for i in ‘alex‘:    if i:        print(44)

原文地址：https://www.cnblogs.com/q240756200/p/9898227.html