类型转换: list string

/*
一: str -> list 
二: list -> str
    1 list元素全为str
    2 list元素不全为str
*/

一: str -> list

if __name__ == '__main__':
    str1 = "12345"
    print(list(str1))       # ['1', '2', '3', '4', '5']

    str1 = "123 abc jik"
    print(str1.split())     # ['123', 'abc', 'jik']

    str1 = "www.baidu.com"
    print(str1.split("."))  # ['www', 'baidu', 'com']

二: list -> str
　　1 list元素全为str

if __name__ == '__main__':
    k = ["11", "22", "-3"]
    print("k:", "".join(k)) # k: 1122-3

　　2 list元素不全为str

if __name__ == '__main__':
    # 报错
    k = ["11", "22", -3]
    print("k:", "".join(k))   # TypeError: sequence item 2: expected str instance, int found

    # 方法一
    k = ["11", "22", -3]
    s = ""
    for i in k:
        s += (str(i))
    print("k:", s)                  # k: 1122-3

    # 方法一
    k = [11, "22", -3]
    print("k:", "".join(str(k)))    # k: [11, '22', -3]