forms.py 文件源码

def validate_hex(form, field):
    data = field.data

    error = ValidationError('%r is not a valid hex color')

    # Strip a leading # for the hex number
    if data.startswith('#'):
        data = data[1:]

    if len(data) not in (3, 6):
        raise error

    if any(c not in string.hexdigits for c in data):
        raise error