ValueError：Pandas 中的数组长度必须相同
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ValueError: arrays must all be same length in Pandas
提问by Terry T.
I was following Sentdex's second tutorial on pandas basics, and ran into this problem. Here's my code up to this point:
我正在关注Sentdex 关于Pandas基础知识的第二个教程，并遇到了这个问题。到目前为止，这是我的代码：
import pandas as pd
import matplotlib.pyplot as plt
from matplotlib import style
style.use('ggplot')
web_stats = {'Day' : [1,2,3,4,5,6],
'Visitors' : [43,53,34,45,64,34],
'Bounce_Rate' : [65,72,62,64,66]}
df = pd.DataFrame(web_stats)
print(df)
I was really confused when this error message popped up. Please note that I'm on a mac.
当这个错误信息弹出时，我真的很困惑。请注意，我使用的是 mac。
Traceback (most recent call last):
File "/Users/Terry/Documents/df.py", line 10, in <module>
df = pd.DataFrame(web_stats)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pandas/core/frame.py", line 275, in __init__
mgr = self._init_dict(data, index, columns, dtype=dtype)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pandas/core/frame.py", line 411, in _init_dict
return _arrays_to_mgr(arrays, data_names, index, columns, dtype=dtype)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pandas/core/frame.py", line 5496, in _arrays_to_mgr
index = extract_index(arrays)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pandas/core/frame.py", line 5544, in extract_index
raise ValueError('arrays must all be same length')
ValueError: arrays must all be same length
>>>
Any help would be much appreciated.
任何帮助将非常感激。
回答by alexisdevarennes
Bounce_Rate has less values than the amount of days / visitors. Check your web_stats dictionary
Bounce_Rate 的值小于天数/访问者的数量。检查您的 web_stats 字典
I.e. adding an item (an inti.e. a number) to that list would fix it. But make sure, you notice in the below example I change the list values to [65, 72, 62, 64, 54, 66] according to comments. You will probably want to check which values should go there.
即添加一个项目（int即一个数字）到该列表将修复它。但是请确保您注意到在下面的示例中我根据注释将列表值更改为 [65, 72, 62, 64, 54, 66] 。您可能想要检查哪些值应该放在那里。
import pandas as pd
import matplotlib.pyplot as plt
from matplotlib import style
style.use('ggplot')
web_stats = {'Day' : [1,2,3,4,5,6],
'Visitors' : [43,53,34,45,64,34],
'Bounce_Rate' : [65, 72, 62, 64, 54, 66]} # Copied values from tutorial according to comments.
df = pd.DataFrame(web_stats)
print(df)
