JoinThis method combines strings in a list or other iterable collection. It is called with an unusual syntax form. We call it on the delimiter that will come between the iterables values.
With join, we reverse the split() operation. We can use a delimiter of zero, one or more characters. Any string can be used—but simple ones are usually best.
Here we use the join() method. The method is called on a string (usually a string literal) and then the list is passed as the argument.
Join only places delimiters between strings, not at the start or end of the result. This is different from some loop-based approaches.string) and with a delimiter (a comma string).list = ["a", "b", "c"] # Join with empty string literal. result = "".join(list) # Join with comma. result2 = ",".join(list) # Display results. print(result) print(result2)abc a,b,c
We cannot join together a list of integers. But we can call map() to convert each integer into a string, and then join() the result of map.
map() to transform or convert each element. Other operations can be used as well—try passing in a lambda.list = [10, 20, 30] # Map each integer to a string with str. list_mapped = map(str, list) # Join together with comma. result = ",".join(list_mapped) print(result)10,20,30
It is best to avoid calling join() more than needed. For complex data structures, keep all elements in lists or maps—avoid excessive split() and join calls.
Join() is called on a string—often a string literal. This syntax confuses most beginning Python developers. But it makes logical sense—we are joining on a delimiter.