how to change [1,2,3,4] to '1234' using python ..

Question

i want get a string from a list

thanks

Answer 1

''.join(map(str, [1,2,3,4] ))

• map(str, array) is equivalent to [str(x) for x in array], so map(str, [1,2,3,4]) returns ['1', '2', '3', '4'].

• s.join(a) concatenates all items in the sequence a by the string s, for example,

  >>> ','.join(['foo', 'bar', '', 'baz'])
  'foo,bar,,baz'
  

  Note that .join can only join string sequences. It won't call str automatically.

  >>> ''.join([1,2,3,4])
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
  TypeError: sequence item 0: expected string, int found
  

  Therefore we need to first map all items into strings first.

Answer 2

''.join(str(i) for i in [1,2,3,4])

Answer 3

You can use the str.join() function.

''.join(map(str,[1,2,3,4])) is the easiest way to get '1234' from [1,2,3,4]. If you wish to have another separator just change the string you call join on (ex: ' '.join(map(str,[1,2,3,4])) separates the elements of your list with a space).