尝试循环字典以获取计数器时遇到 KeyError答案

【问题标题】：Got KeyError for trying to loop a dictionary to get a counter尝试循环字典以获取计数器时遇到 KeyError
【发布时间】：2020-12-16 07:53:04
【问题描述】：

我正在 youtube 上进行一项练习，我试图在 csv 数据中获取字典计数器。代码如下：

import pandas as pd
from collections import Counter

URL = 'https://raw.githubusercontent.com/CoreyMSchafer/code_snippets/master/Python/Matplotlib/02-BarCharts/data.csv'

data = pd.read_csv(url)
df = pd.DataFrame.to_dict(data)

language_counter = Counter()

for i in df:
     language_counter.update(df['LanguagesWorkedWith'][i].split(';'))

print(language_counter)

知道出了什么问题吗？这是显示的错误：

Traceback (most recent call last):
  File "C:/Users/jong5/PycharmProjects/learning/matplotlib/matplotlib-Bar.py", line 14, in <module>
    language_counter.update(df['LanguagesWorkedWith'][i].split(';'))
KeyError: 'Responder_id'

'Responder_id' 是第一个列名。感谢任何帮助，谢谢！

【问题讨论】：

df['LanguagesWorkedWith'] 中不存在键“Responder_id”。我想这是一个字典。

标签： python dictionary counter

【解决方案1】：

没有熊猫

import requests
from collections import Counter

r = requests.get(
    'https://raw.githubusercontent.com/CoreyMSchafer/code_snippets/master/Python/Matplotlib/02-BarCharts/data.csv')
if r.status_code == 200:
    counter = Counter()
    text = r.text
    lines = text.split()
    for idx, line in enumerate(lines):
        if idx > 0:
            line = line.strip()
            comma_idx = line.find(',')
            counter.update(line[comma_idx:].split(';'))
    print(counter.most_common(5))

输出

[('JavaScript', 57290), ('SQL', 47272), ('HTML/CSS', 40015), ('Python', 34645), ('Java', 31019)]

【讨论】：

【解决方案2】：

在不需要迭代列时使用to_dict。请改用for column_value in data_frame['column_name']。

import pandas as pd
from collections import Counter

URL = 'https://raw.githubusercontent.com/CoreyMSchafer/code_snippets/master/Python/Matplotlib/02-BarCharts/data.csv'

data = pd.read_csv(url)

# remove this line
# df = pd.DataFrame.to_dict(data)

language_counter = Counter()

# and select a column directly
for lang in data['LanguagesWorkedWith']:
     language_counter.update(lang.split(';'))

print(language_counter)

【讨论】：

正在尝试遍历“LanguagesWorkedWith”列下的字典值。尝试了这段代码并得到了错误：AttributeError: 'int' object has no attribute 'split'

【解决方案3】：

感谢各位的回复，玩了一圈终于找到了办法。对不起，如果我不清楚这些问题。这是修改后的代码：

for i in df['LanguagesWorkedWith']:
    language_counter.update(df['LanguagesWorkedWith'][i].split(';'))

print(language_counter)

【讨论】：