萌新知道这个错误但不会改 TypeError: string indices must be integers, not str

TypeError: string indices must be integers, not str
这个问题应该怎么修改 萌新求教

#!/usr/bin/python
# -*- coding:utf-8 -*-
import re
import sys
import os
import json

def discover():
    d = {}
    d['data'] = []
    with os.popen("docker ps -a --format {{.ID}}") as pipe:  # 找到容器ID返回给pipe
        for line in pipe:
            c_id = line.replace("\n", "")
            info = {}
            info['{#CONTAINER_ID}'] = c_id
            cmd_CPU = 'docker stats %s --no-stream --format "table{{.CPUPerc}}"' % c_id
            cmd_MEM = 'docker stats %s --no-stream --format "table{{.MemUsage}}"' % c_id
            try:
                f1 = os.popen(cmd_CPU).read()
                f2 = os.popen(cmd_MEM).read()
                if len(f1) == 0:
                    continue
                info['{#CPU}'] = f1.split('\n')[1]
                if len(f2) == 0:
                    continue
                a = f2.split('\n')[1]
                print(a)
                MEM = a.split('/')
                s = MEM[0].strip()
                print("内存:"+s)
                l = re.search('([-+]?[0-9]*\.?[0-9]+)([a-zA-Z]+)', s)
                num = float(l.group(1))
                d = l.group(2)
                print("num:" + str(num))
                print("单位:" + d)
                if d == 'GiB':
                    a = str(num * 1024)
                    result = a + 'MiB'
                    print("情况1")
                    info['{#MEM}'] = result
                elif d == 'KiB':
                    a = str(num / 1024)
                    result = a + 'MiB'
                    print("情况2")
                    info['{#MEM}'] = result
                else:
                    print("其他情况")
                    info['{#MEM}'] = s
            except:
                print("没有取到内存")
                info['{#CPU}'] = ""
                info['{#MEM}'] = ""

            d['data'].append(info)
    print (json.dumps(d))

def status(name, action):
    if action == "ping":
        cmd = 'docker inspect --format="{{.State.Running}}" %s' % name
        result = os.popen(cmd).read().replace("\n", "")
        if result == "true":
            print (1)
        else:
            print (0)
    else:
        cmd = 'docker stats %s --no-stream --format "{{.%s}}"' % (name,action)
        result = os.popen(cmd).read().replace("\n", "")
        if "%" in result:
            print (float(result.replace("%", "")))
        else:
            print (result)


if __name__ == '__main__':
    try:
        name, action = sys.argv[1], sys.argv[2]
        status(name, action)
    except IndexError:
        discover()![图片说明](https://img-ask.csdn.net/upload/202009/25/1601000962_903086.png)

d['data'] = []
这里d是数组，不是字典，没有data

是因为

d = l.group(2)

把上面定义的

 d = {}

覆盖了

所以变量命名尽量有意义，不能重名