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How do I select rows from a DataFrame based on column values? Only, when the size of the dataframe approaches million rows, many of the methods tend to take ages when using df[df['col']==val] I wanted to have all possible values of "another_column" that correspond to specific values in "some_column" (in this case in a dictionary)
python - What is df. values [:,1:]? - Stack Overflow df values returns a numpy array with the underlying data of the DataFrame, without any index or columns names [:, 1:] is a slice of that array, that returns all rows and every column starting from the second column (the first column is index 0)
Why do df and du commands show different disk usage? 15 Ok, lets check the man pages: df - report file system disk space usage and du - estimate file space usage Those two tools were meant for different propose While df is to show the file system usage, du is to report the file space usage du works from files while df works at filesystem level, reporting what the kernel says it has available
How to iterate over columns of a pandas dataframe 66 This answer is to iterate over selected columns as well as all columns in a DF df columns gives a list containing all the columns' names in the DF Now that isn't very helpful if you want to iterate over all the columns But it comes in handy when you want to iterate over columns of your choosing only
Detect and exclude outliers in a pandas DataFrame import pandas as pd import numpy as np from scipy import stats df = pd DataFrame(np random randn(100, 3)) df[(np abs(stats zscore(df)) < 3) all(axis=1)] Description: For each column, it first computes the Z-score of each value in the column, relative to the column mean and standard deviation It then takes the absolute Z-score because the direction does not matter, only if it is below the
How to get set a pandas index column title or name? To just get the index column names df index names will work for both a single Index or MultiIndex as of the most recent version of pandas As someone who found this while trying to find the best way to get a list of index names + column names, I would have found this answer useful: