请大神帮忙看看，为啥出错了
原代码如下：#! python3
# combinePdfs.py - Combines all the PDFs in the current working directory into a single PDF.
import PyPDF2, os
# 找到文件夹中所有的PDF文件
pdfFiles = []
for filename in os.listdir('.'):
if filename.endswith('.pdf'):
pdfFiles.append(filename)
pdfFiles.sort(key/str.lower)
pdfWriter = PyPDF2.PdfFileWriter()
#打开每个PDF文件
for filename in pdfFiles:
pdfFileObj = open(filename, 'rb')
pdfReader = PyPDF2.PdfFileReader(pdfFileObj)
#添加每一页
for pageNum in range(1, pdfReader.numPages):
pageObj = pdfReader.getPage(pageNum)
pdfWriter.addPage(pageObj)
#保存结果
pdfOutput = open('allminutes.pdf', 'wb')
pdfWriter.write(pdfOutput)
pdfOutput.close()
但是出现了这样报错：
NameError: name 'key' is not defined
怎样解决呢？
pdfFiles.sort(key/str.lower) 这行代码参数应该要引号吧？
这里的 key 没定义才会导致你报错 ，其他的不太清楚，没用过这个模块
help(list.sort)
Help on method_descriptor:
sort(self, /, *, key=None, reverse=False)
Sort the list in ascending order and return None.
The sort is in-place (i.e. the list itself is modified) and stable (i.e. the
order of two equal elements is maintained).
If a key function is given, apply it once to each list item and sort them,
ascending or descending, according to their function values.
The reverse flag can be set to sort in descending order.
我看不懂，你参考参考{:10_266:} pdfFiles.sort(key=str.lower) 将pdfFiles.sort(key/str.lower) 改成pdfFiles.sort(reverse=True),
也可以指定 reverse 关键字参数为 True，让 sort()按逆序排序
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