小编Z.C*_*hen的帖子

我正在尝试调整条形码输出的大小

import barcode
from barcode.writer import ImageWriter

bar_class = barcode.get_barcode_class('code128')
barcode = '1234567890'
writer=ImageWriter()
writer.set_options({module_width:2, module_height:2})
code128 = bar_class(barcode, writer)
code128.save('filename')

我收到的错误是：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'module_width' is not defined

我真的不明白如何使用这里找到的文档：https ://pythonhosted.org/pyBarcode/writers/index.html

我正在尝试下载PDF,但是我收到以下错误:HTTP错误403:禁止

我知道服务器因任何原因都在阻塞,但我似乎无法找到解决方案.

import urllib.request
import urllib.parse
import requests


def download_pdf(url):

full_name = "Test.pdf"
urllib.request.urlretrieve(url, full_name)


try: 
url =         ('http://papers.xtremepapers.com/CIE/Cambridge%20IGCSE/Mathematics%20(0580)/0580_s03_qp_1.pdf')

print('initialized')

hdr = {}
hdr = {
'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_2)     AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36',
'Content-Length': '136963',
}



print('HDR recieved')

req = urllib.request.Request(url, headers=hdr)

print('Header sent')

resp = urllib.request.urlopen(req)

print('Request sent')

respData = resp.read()

download_pdf(url)


print('Complete')

except Exception as e:
print(str(e))