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So the following reproduces this error: Note that if the columns are not given as list, pandas Series, numpy array or Pandas Index, this error won't occur. To do so, replace the None in the padding line with your custom value: Replace custom_value with the value you want to use for padding. So the following doesn't reproduce the error: One interesting edge case occurs when the list-like object is multi-dimensional (but not a numpy array). The string methods won't work because it's not a string but a set stored in the cell. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); [pandas] ValueError: Columns must be same length askey. How do I get the number of elements in a list (length of a list) in Python? It only takes a minute to sign up. If I wanted to do 1:1 mapping of elements of a new list into that one: Obviously this will throw an IndexError, because it's trying to get elements that otherlist just doesn't have. valueerror weve discussed why it raises the ValueError and how to fix it along with practical examples. Which doesn't make sense to me since the column is called sentiment. For example, if you try to assign a 2-column numpy array to 3 columns, youll see the ValueError. Connect and share knowledge within a single location that is structured and easy to search. Can you still use Commanders Strike if the only attack available to forego is an attack against an ally? Selecting multiple columns in a Pandas dataframe. To conclude the article on how to fix the ValueError: columns must be the same length as key error, weve discussed why it raises the ValueError and how to fix it along with practical examples. The following reproduce the error: Case 3: When you try to replace the values of existing column(s) by a DataFrame (or a list-like object) whose number of columns doesn't match the number of columns it's replacing. WebValueError: Columns must be same length as key. valueerror: columns must be same length as key [4, 5]}) ``` ``` ValueError: columns must be same length as key ``` `col2` 2 `col1` 3 DataFrame This repository has been archived by the owner on Oct 26, 2022. You are trying to insert a string (len=1) to a column of length n>1. python - ValueError: Columns must be same length as key