python - 计算文件中的每个字符

Question

我正在尝试计算文件中的每个字符并将其放入字典中。但这不太奏效，我没有得到所有字符。

#!/usr/bin/env python
import os,sys

def count_chars(p):
     indx = {}
     file = open(p)

     current = 0
     for ch in file.readlines():
          c = ch[current:current+1]
          if c in indx:
               indx[c] = indx[c]+1
          else:
               indx[c] = 1           
          current+=1
     print indx

if len(sys.argv) > 1:
     for e in sys.argv[1:]:
          print e, "contains:"
          count_chars(e)
else:
     print "[#] Usage: ./aufg2.py <filename>"

Answer 1

假设您正在计算的文件适合内存:

import collections
with open(p) as f:
    indx = collections.Counter(f.read())

---

否则，您可以一点一点地阅读它:

import collections
with open(p) as f:
    indx = collections.Counter()
    buffer = f.read(1024)
    while buffer:
        indx.update(buffer)
        buffer = f.read(1024)