[Python] QR Code image generator

import urllib.request
def main():
    filename = input('Please enter a filename:')
    data = input('Please enter the data which you want to convert to qr code:')
    width = input('Please enter a width for the image:')
    height = input('Please enter a height for the image:')
    ecLevel = input('Please enter EC level (Optional default L):')
    margin = input('Please enter margins (Optional default 0):')

    if(has_input(filename) and has_input(data) and has_input(width) and has_input(height)):
        if(has_input(ecLevel) and has_input(margin)):
            generate_qr_image(filename, data, width, height, ecLevel, margin)
        elif(has_input(ecLevel)):
            generate_qr_image(filename, data, width, height, ecLevel)
        elif(has_input(margin)):
            generate_qr_image(filename, data, width, height,'L',margin)
        else:
            generate_qr_image(filename, data, width, height)


def generate_qr_image(filename, data, width, height, eclevel = 'L', margin = '0'):
    if(has_input(filename) and has_input(data) and has_input(width) and has_input(height)):
        try:
            url = 'http://chart.apis.google.com/chart?chs='
            data = '&chl=' + data
            size = width + 'x' + height
            chart = '&cht=qr&'
            level = 'chld=' + eclevel

            sh = urllib.request.urlopen(url + size + chart + level + '|' + margin + data)
            fh = open(filename + '.png', 'wb')
            fh.write(sh.read())
            fh.close()
            sh.close()
            print('[X] QR image saved thank you Google!')
        except Exception as Ex:
            print(repr(Ex))


def has_input(data):
    if(data != ''):
        return True
    else:
        return False


if __name__ == '__main__':
    main()