pandas Archives - Page 20 of 25

How do I create test and train samples from one dataframe with pandas?

I have a fairly large dataset in the form of a dataframe and I was wondering how I would be able to split ...

May 5, 2022
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Pandas read_csv low_memory and dtype options

When calling df = pd.read_csv('somefile.csv') I get: /Users/josh/anaconda/envs/py27/lib/python2.7/site-packages/pandas/io/parsers.py:1130: DtypeWarning: Columns (4,5,7,16) have mixed types. Specify dtype option on import or set low_memory=False. Why ...

May 5, 2022
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Convert Python dict into a dataframe

I have a Python dictionary like the following: {u'2012-06-08': 388, u'2012-06-09': 388, u'2012-06-10': 388, u'2012-06-11': 389, u'2012-06-12': 389, u'2012-06-13': 389, u'2012-06-14': 389, u'2012-06-15': ...

May 4, 2022
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How to reset index in a pandas dataframe? [duplicate]

This question already has answers here: How to convert index of a pandas dataframe into a column (7 answers) Closed 2 years ago. ...

May 4, 2022
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how to sort pandas dataframe from one column

I have a data frame like this: print(df) 0 1 2 0 354.7 April 4.0 1 55.4 August 8.0 2 176.5 December 12.0 ...

May 4, 2022
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Pandas – How to flatten a hierarchical index in columns

I have a data frame with a hierarchical index in axis 1 (columns) (from a groupby.agg operation): USAF WBAN year month day s_PC ...

May 4, 2022
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How to select all columns, except one column in pandas?

I have a dataframe look like this: import pandas import numpy as np df = DataFrame(np.random.rand(4,4), columns = list('abcd')) df a b c ...

May 4, 2022
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How to check if a column exists in Pandas

Is there a way to check if a column exists in a Pandas DataFrame? Suppose that I have the following DataFrame: >>> import ...

May 4, 2022
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Remap values in pandas column with a dict, preserve NaNs

I have a dictionary which looks like this: di = {1: "A", 2: "B"} I would like to apply it to the col1 ...

May 3, 2022
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