'one two three' into one_two_three."_".join('one two three'), but that gives me o_n_e_ _t_w_o_ _t_h_r_e_e_..."_" only at spaces between words in a string?You can also split/join:
'_'.join('one two three'.split())
And if you want to use join only , so you can do like thistest="test string".split()
"_".join(test) This will give you output as "test_string".
'one two three'.replace(' ', '_') # 'one_two_three' str.join method takes an iterable as an argument and concatenate the strings in the iterable, string by itself is an iterable so you will separate each character by the _ you specified, if you directly call _.join(some string).The join() method takes iterable – objects capable of returning their members one at a time. Some examples are List, Tuple, String, Dictionary, and Set
Return Value:
The join() method returns a string concatenated with the elements of iterable.
Type Error:
If the iterable contains any non-string values, it raises a TypeError exception.
# Python program to demonstrate the
# use of join function to join list
# elements with a character.
list1 = ['1','2','3','4']
s = "-"
# joins elements of list1 by '-'
# and stores in sting s
s = s.join(list1)
# join use to join a list of
# strings to a separator s
print(s)
