ASCII Tables with Python 3

ascii_table.py

# Python 3
def pprinttable(rows):
    if len(rows) > 1:
        headers = rows[0]._fields
        lens = []
        for i in range(len(rows[0])):
            lens.append(len(max([x[i] for x in rows] + [headers[i]],key=lambda x:len(str(x)))))
        formats = []
        hformats = []
        for i in range(len(rows[0])):
            if isinstance(rows[0][i], int):
                formats.append("%%%dd" % lens[i])
            else:
                formats.append("%%-%ds" % lens[i])
            hformats.append("%%-%ds" % lens[i])
        pattern = " | ".join(formats)
        hpattern = " | ".join(hformats)
        separator = "-+-".join(['-' * n for n in lens])
        print(hpattern % tuple(headers))
        print(separator)
        for line in rows:
            print(pattern % tuple(line))
    elif len(rows) == 1:
        row = rows[0]
        hwidth = len(max(row._fields,key=lambda x: len(x)))
        for i in range(len(row)):
            print("%*s = %s" % (hwidth,row._fields[i],row[i]))

from collections import namedtuple
Row = namedtuple('Row',['first','second','third'])
data = Row(1,2,3)
pprinttable([data, data])