在 Python 中填充 n 个字符

def header(txt: str, width=30, filler='*', align='c'):
    assert align in 'lcr'
    return {'l': txt.ljust, 'c': txt.center, 'r': txt.rjust}[align](width, filler)
print(header("Canada"))
print(header("Canada", align='l'))
print(header("Canada", align='r'))

Output:

************Canada************
Canada************************
************************Canada