python - 解决类型错误 : 'file' object has no attribute '__getitem__'

Question

我正在尝试创建一个文件，该文件仅包含文件 1 中的名称而不包含文件 1 中的名称。运行以下代码时出现错误:

import pandas
import csv
f = pandas.read_csv('hillelclass2019.csv')
g = pandas.read_csv('shabsignup.csv')
for i in range(193): #length of data1
    x = str(f['First Name'][i]) + " " + str(f['Last Name'][i]) #first name + last name
    a = 0 #initial
    for j in range(25): #length of data2
        if g['Name'][j] == x: #if name == name on other sheet, then a == 1
            a == 1
    if a == 0: #if names are not equal 
        with open('noshab.csv', 'a') as f: #write name to file
            wtr = csv.writer(f, delimiter= ',')
            wtr.writerow( [x,i])

错误:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
/var/folders/kz/351q8p011qjc2x4k9srypcqc0000gn/T/tmpf4VgQX.py in <module>()
      5 g = pandas.read_csv('shabsignup.csv')
      6 for i in range(193): #length of data1
----> 7     x = str(f['First Name'][i]) + " " + str(f['Last Name'][i]) #first name + last name
      8     a = 0 #initial
      9     for j in range(25): #length of data2

TypeError: 'file' object has no attribute '__getitem__' 

当我在 range(1) 中设置 i 并且只运行 1 次迭代时，该代码有效，但不适用于多行。

Answer 1

您已将 f 绑定(bind)到循环中的文件对象，因此在一次迭代后它不再指向您的 df 所以 f['First Name'] [i] 是 file_object['First Name'][i] 而不是 your_dataframe['First Name'][i] 所以它显然失败了:

with open('noshab.csv', 'a') as f: # <- f is now a file object

将名称从 f = pandas.read_csv('hillelclass2019.csv') 更改为 df = pandas.read_csv('hillelclass2019.csv') 并使用 df 引用代码中的数据框:

df = pandas.read_csv('hillelclass2019.csv')
g = pandas.read_csv('shabsignup.csv')
for i in range(193): #length of data1
    x = str(df['First Name'][i]) + " " + str(df['Last Name'][i]) #first name + last name

关于 if g['Name'][j] == x: 中的另一个注释 a == 1 什么都不做，我想你的意思是 a = 1。