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How do I get the row count of a Pandas DataFrame? could use df info () so you get row count (# entries), number of non-null entries in each column, dtypes and memory usage Good complete picture of the df If you're looking for a number you can use programatically then df shape [0]
What is the meaning of `df [df [factor]]` syntax in Pandas? The second df in df[df['factor']] refers to the DataFrame on which the boolean indexing is being performed The boolean indexing operation [df['factor']] creates a boolean mask that is a Series of True and False values with the same length as the DataFrame
python - What is df. values [:,1:]? - Stack Overflow df values is gives us dataframe values as numpy array object df values [:, 1:] is a way of accessing required values with indexing It means all the rows and all columns except 0th index column in dataframe
python - Renaming column names in Pandas - Stack Overflow To focus on the need to rename of replace column names with a pre-existing list, I'll create a new sample dataframe df with initial column names and unrelated new column names