'NoneType'對象沒有屬性'decode'

Question

我練習編寫一些代碼來從GitHub獲取Python的頂級存儲庫，這是我看到的錯誤：

這是導致上述錯誤的代碼：

import requests 
import pygal
from pygal.style import LightColorizedStyle as LCS, LightenStyle as LS


path = 'https://api.github.com/search/repositories?q=language:python&sort=stars'

r = requests.get(path)

response_dict = r.json()

# Explore information about the repositories.
repo_dicts = response_dict['items']

names, plot_dicts = [], []
for repo_dict in repo_dicts:
    names.append(repo_dict['name'])
    plot_dict = {
        'value': repo_dict['stargazers_count'],
        'label': repo_dict['description'],
        'xlink': repo_dict['html_url'],
    }
    plot_dicts.append(plot_dict)

my_style = LS('#333366', base_style=LCS)
# Make visualization.
my_config = pygal.Config()
chart = pygal.Bar(my_config, style=my_style)


my_style = LS('#333366', base_style=LCS)
chart.title = 'Most-Starred Python Projects on GitHub'
chart.x_labels = names

chart.add('', plot_dicts)
chart.render_to_file('python_repos.svg')

你能幫我這個忙嗎？ 謝謝

Answer 1

我看着你的代碼。 看起來有些鏈接沒有標簽（因此它們的類型為None）。 請參見此處 。 _compat.py然后嘗試對None-Type調用方法decode ("utf-8") ，這將導致相應的崩潰。

我建議plot_dicts中所有沒有標簽的條目都用空字符串標記，如下面的代碼所示。 下面的代碼對我有用。

import requests
import pygal
from pygal.style import LightColorizedStyle as LCS, LightenStyle as LS


path = 'https://api.github.com/search/repositories?q=language:python&sort=stars'

r = requests.get(path)

response_dict = r.json()

# Explore information about the repositories.
repo_dicts = response_dict['items']

names, plot_dicts = [], []
for repo_dict in repo_dicts:
    names.append(repo_dict['name'])
    plot_dict = {
        'value': repo_dict['stargazers_count'],
        'label': repo_dict['description'],
        'xlink': repo_dict['html_url'],
    }
    plot_dicts.append(plot_dict)

my_style = LS('#333366', base_style=LCS)
# Make visualization.
my_config = pygal.Config()
chart = pygal.Bar(my_config, style=my_style)


my_style = LS('#333366', base_style=LCS)
chart.title = 'Most-Starred Python Projects on GitHub'
chart.x_labels = names

# preprocess labels here
def f(e):
    if e['label'] is None:
        e['label'] = ""
    return e
plot_dicts = list(map(f, plot_dicts))


chart.add('', plot_dicts)
chart.render_to_file('python_repos.svg')

也許您找到了映射列表的更好方法，但這絕對可行。

Answer 2

似乎在期望字符串的某處有一個None值，並且回溯似乎表明它是label值。

嘗試更改此：

plot_dict = {
    'value': repo_dict['stargazers_count'],
    'label': repo_dict['description'],
    'xlink': repo_dict['html_url'],
}

對此：

plot_dict = {
    'value': repo_dict['stargazers_count'],
    'label': repo_dict['description'] or "",
    'xlink': repo_dict['html_url'],
}