Python 3 - TypeError：'map'对象不可下标[重复]

Question

我目前正在将此作为 i/o 流的一段代码运行 - 我收到以下错误 TypeError: 'map' object is not subscriptable for the print (bytest[:10])。在 Python 3 中运行它的正确方法是什么？

with open("/bin/ls", "rb") as fin: #rb as text file and location 
  buf = fin.read()
bytes = map(ord, buf)    
print (bytes[:10])
saveFile = open('exampleFile.txt', 'w')
saveFile.write(bytes)
saveFile.close()

Answer 1

在 Python 3 中，map 返回一个生成器。尝试先从它创建一个list。

with open("/bin/ls", "rb") as fin: #rb as text file and location 
  buf = fin.read()
bytes = list(map(ord, buf))
print (bytes[:10])
saveFile = open('exampleFile.txt', 'w')
saveFile.write(bytes)
saveFile.close()

如果你觉得这很难看，你可以用列表生成器替换它：

bytes = [ord(b) for f in buf]