[已解决]递归函数中的全局变量问题

import openpyxl
import os
def search_file(start_dir,target):
    os.chdir(start_dir)
    for each_file in os.listdir(os.curdir):
        ext = os.path.splitext(each_file)[1]
        if ext in target:
            wb = openpyxl.load_workbook(each_file)
            ws = wb['Sheet1']
            file_dict[each_file]=ws['C4'].value
            #找到excel表格，把每个excle中的C4值添加进字典
        if os.path.isdir(each_file):
            search_file(each_file,target)#递归调用
            os.chdir(os.pardir)#递归调用后,返回上一层目录

start_dir = r'E:\\Z\\test'
file_dict=dict()
target = ['.xlsx','.xlx']

search_file(start_dir,target)

import openpyxl
import os
def search_file(start_dir,target):
    os.chdir(start_dir)
    file_name = start_dir.rsplit('\\',1)[1]
    for each_file in os.listdir(os.curdir):
        ext = os.path.splitext(each_file)[1]
        if ext in target:
            wb = openpyxl.load_workbook(each_file)
            ws = wb['Sheet1']
            file_dict[file_name]=ws['C4'].value
            
        if os.path.isdir(each_file):
            search_file(each_file,target)
            os.chdir(os.pardir)

start_dir = r'E:\\Z\\test'
file_dict=dict()
target = ['.xlsx','.xlx']

search_file(start_dir,target)