【Python基础知识】（28）序列类型的相互转换

# 序列类型间的相互转换
l1 = ['a', 'b', 'c']
t1 = ('d', 'e', 'f')
s1 = "abc123"
s2 = "abc,123"
r1 = range(1, 4)

1. list()：转为列表

# list()函数：将其他函数转为列表

print(list(t1))  # 输出：['d', 'e', 'f']

print(list(s1))  # 输出：['a', 'b', 'c', '1', '2', '3']

print(s2.split(","))  # 输出：['abc', '123']

print(list(r1))  # 输出：[1, 2, 3]

2. tuple()：转为元组

# tuple()函数：将其他函数转换为元组

print(tuple(l1))  # 输出：('a', 'b', 'c')

print(tuple(s1))  # 输出：('a', 'b', 'c', '1', '2', '3')

print(tuple(s2.split(",")))  # 输出：('abc', '123')   若是直接转换会将“,”也分割进去，所以要以list为桥梁

print(tuple(r1))  # 输出：(1, 2, 3)

3. join()、str()：转为字符串

# str()函数用于将单个数据转化为字符串，join()对列表进行连接

print(str(l1))  # 输出：['a', 'b', 'c']

# join要求所有元素必须是字符串，不能包含数字

print("".join(l1))  # 输出：abc

print(",".join(l1))  # 输出：a,b,c

print("|".join(t1))  # 输出：d|e|f

# print(",".join(r1))  # 报错：TypeError: sequence item 0: expected str instance, int found

s3 = ""  # 将包含数字的序列输出

for i in r1:
    s3 += str(i)
print(s3)