Python 中的 Json 和 Pandas 未定义 NameError

Question

尝试从 JSON 文件中提取字符串后的特定行，以 JSON 格式附加数据，然后发送到 Dataframe，这是可行的，但现在不行。有人知道为什么我现在收到 NameError 吗？

z = json.loads(行) NameError: 名称 'line' 未定义

import fileinput, re, json
import pandas as pd

p = [
    "Test/a",
    "Test/b"
]
dir = "/home/****/"

for i,ip in enumerate(p):
    t = ip.replace('/', '')
    directory = dir + t
    found = False
    for line in fileinput.input(directory + "/" + t +"_type.json",inplace=True):
       if re.match('{"p',line):
           found = True
        if found:
           print(line,end="")

   y = {"p":"example"}

   z = json.loads(line)

   z.update(y)

   q = json.dumps(z)

   df = pd.read_json(q)
   for i, g in df.groupby([
      "Apple",
      "Bannana"
       ]):
       print(g)

Answer 1

目前，您的 for 循环从 fileinput.input(directory + "/" + t +"_type.json",inplace=True) 中获取每个项目并将其放入变量 line 中。但是这个变量只在你的 for 循环中定义，所以一旦程序离开循环，它就不再定义了。
根据您希望程序的行为方式，您有几个解决方案，但它们的工作方式几乎相同，您只需选择要执行的内容和时间：

for i,ip in enumerate(p):
    t = ip.replace('/', '')
    directory = dir + t
    found = False
    for line in fileinput.input(directory + "/" + t +"_type.json",inplace=True):
        if re.match('{"p',line):
            found = True
        if found:
            print(line,end="")

            # From there we add 2 levels of indentation in order to execute
            # the code if found is true

            y = {"p":"example"}

            z = json.loads(line)

            z.update(y)

            q = json.dumps(z)

            df = pd.read_json(q)
            for i, g in df.groupby([
               "Apple",
               "Bannana"
                ]):
                print(g)

或

for i,ip in enumerate(p):
    t = ip.replace('/', '')
    directory = dir + t
    found = False
    for line in fileinput.input(directory + "/" + t +"_type.json",inplace=True):
        if re.match('{"p',line):
            found = True
        if found:
            print(line,end="")

        # From there we add 1 levels of indentation in order to execute
        # the code for each iteration of the loop

        y = {"p":"example"}

        z = json.loads(line)

        z.update(y)
        q = json.dumps(z)

        df = pd.read_json(q)
        for i, g in df.groupby([
            "Apple",
            "Bannana"
             ]):
             print(g)

希望对您有所帮助

Python 中的 Json 和 Pandas 未定义 NameError

NameError is not defined with Json and Pandas in Python

python

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dataframe

nameerror

pandas