Print a table from a list of dictionaries

print_table.py

def print_table(data, column_order=None):
    """ Pretty print a list of dictionaries (data) as a dynamically sized table.
    If column names (column_order) aren't specified, they will show in random order.
    Author: Thierry Husson - Use it as you want but don't blame me.
    Source: https://stackoverflow.com/questions/17330139/python-printing-a-dictionary-as-a-horizontal-table-with-headers
    PEP8ed by: mijdavis2
    """
    if not column_order:
        column_order = list(data[0].keys() if data else [])
    l = [column_order]  # 1st row = header
    for item in data:
        l.append([str(item[col] or '') for col in column_order])
    column_size = [max(map(len, col)) for col in zip(*l)]
    formatStr = ' | '.join(["{{:<{}}}".format(i) for i in column_size])
    l.insert(1, ['-' * i for i in column_size])  # Seperating line
    for item in l:
        print(formatStr.format(*item))