Adds timestamp to the end of string. Useful for file names.

timestamp_string.py

from datetime import datetime

def timestamp_string(string, file_ext=True, hidden_file=False):
    """ Adds a timestamp to the end of a string in the format
    YYYY_MM_DD_hhmm.
    
    Parameters:
    string: str
        string to be timestamped
    file_ext: bool
        specifies whether the string has a file extension
    hidden_file: bool
        specifies whether file starts with '.'
    """
    stamp = '_{}'.format(datetime.strftime(datetime.utcnow(), '%Y_%m_%d_%H%M'))
    if file_ext:
        string = string.split('.')
        if hidden_file:
            string[1] = string[1] + stamp
        else:
            string[0] = string[0] + stamp
        return '.'.join(string)
    else:
        return string + stamp