一行和递归:

def count_files(path):
    return sum([len(files) for _, _, files in os.walk(path)])

count_files('path/to/dir')

def directory(path,extension):
  list_dir = []
  list_dir = os.listdir(path)
  count = 0
  for file in list_dir:
    if file.endswith(extension): # eg: '.txt'
      count += 1
  return count

下面是一个简单的单行命令，我觉得很有用:

print int(os.popen("ls | wc -l").read())

很简单:

print(len([iq for iq in os.scandir('PATH')]))

它只是简单地计算目录中的文件数量，我使用了列表理解技术来遍历特定目录，返回所有文件。"len(返回列表)"返回文件数。

我找到了另一个可能是正确的公认答案。

for root, dirs, files in os.walk(input_path):    
for name in files:
    if os.path.splitext(name)[1] == '.TXT' or os.path.splitext(name)[1] == '.txt':
        datafiles.append(os.path.join(root,name)) 


print len(files) 

def count_em(valid_path):
   x = 0
   for root, dirs, files in os.walk(valid_path):
       for f in files:
            x = x+1
print "There are", x, "files in this directory."
return x

摘自本文