1. Convert a
str List to string
We could use
str.join() method to convert a list that has
str data type elements to a string.
A = ["a", "b", "c"] StrA = "".join(A) print(StrA) ## StrA is "abc"
join method concatenates any number of strings, the string whose method is called is inserted in between each given string. As shown in the example, the string
"", an empty string, is inserted between the list elements.
If you want a space is added between the elements, then you should use
StrA = " ".join(A) ## StrA is "a b c"
2. Convert a non-
str list to a string
join method requires the
str data type as the given parameters. Therefore, if you try to join the
int type list, you will get the
>>> a = [1,2,3] >>> "".join(a) Traceback (most recent call last): File "<pyshell#1>", line 1, in <module> "".join(a) TypeError: sequence item 0: expected str instance, int found
int type should be converted to
str type before it is joined.
>>> a = [1,2,3] >>> "".join([str(_) for _ in a]) "123"
>>> a = [1,2,3] >>> "".join(map(str, a)) '123'
map function applies the
str function to all the items in the list