join函数

语法

str.join(sequence)

参数

sequence: 要连接的元素序列

实例一

连接字符串

str1 = '-'
seq1 = ('a','b','c') 
print(str1.join(seq1)) # a-b-c

实例二

连接数组(数组元素为字符串)

str2 = '*' 
seq2 = ['a','b','c'] 
print(str2.join(seq2)) # a*b*c

实例三

连接数组(数组元素为数字) 

错误示范:会触发TypeError: sequence item 0: expected string, int found的错误

str3 = '*'
seq3 = [1,2,3] 
# TypeError: sequence item 0: expected str instance, int found
print(str3.join(seq3)) 

正确的示范:

str3 = '*'
seq3 = [1,2,3] 
seq4 = [] 
for i in range(len(seq3)): 
    seq4.append(str(seq3[i])) 
print(str3.join(seq4)) # 1*2*3
print(str3.join(str(i) for i in seq4)) # 1*2*3