Thanks to antville.org

setting colors in pandas

shantanuo — Thu, 20 Feb 2020 05:53:49 GMT

This is how to set the colors in pandas

mapper = {v: k for k, v in enumerate(colors.unique())}

ccolors.cat.reorder_categories(mapper).cat.codes

apply colors to pandas

shantanuo — Wed, 12 Feb 2020 08:57:51 GMT

Here is how to change the color of negative values to red in pandas.

def color_negative_red(val):color = 'red' if val < 0 else 'black'return 'color: %s' % color

df = df.style.applymap(color_negative_red)

14 days ago

shantanuo — Tue, 14 Jan 2020 14:26:42 GMT

This is the python way of calculating the date that is 14 days ago.

import datetime(datetime.datetime.now() - datetime.timedelta(days = 14)).date()

And this is pandas way of getting the same results:

import pandas as pd(pd.datetime.today() - pd.offsets.Day(14)).floor('D')

Change default head rows from 5 to 3

shantanuo — Thu, 03 Oct 2019 08:05:10 GMT

from functools import partialmethodpd.DataFrame.head = partialmethod(pd.DataFrame.head, n=3)

Infer types in pandas

shantanuo — Sun, 16 Dec 2018 13:50:12 GMT

This will return the mixed datatypes but this can be slow.

df.applymap(type).nunique() > 1

Better approach pythonic approach would be...

from pandas.api.types import infer_dtype

infer_dtype(df.A)'mixed-integer'

df.apply(lambda x: 'mixed' in infer_dtype(x))

Python objects and methods

shantanuo — Sat, 18 Aug 2018 13:11:11 GMT

Here are important python objects and their methodsint mul, add, eq, ge, mod, powfloat .is_integer()string .upper(), .endswith(), .split()bool .numerator .abs()list .append, .pop, len() / slicingtupledict .items(), .keys(), .values() / slicingpd.Series .sum(), .stack(), .groupby(), .resample(), .sort_values(), .sort_index(), .ilocpd.DataFrame

JSON to DF

shantanuo — Wed, 08 Aug 2018 11:12:27 GMT

Here is how to read a JSON file into pandas dataframe.

import jsonimport pandas as pd

with open('/tmp/aclImdb/movie_data/gv.json', 'r') as f:data = json.load(f)

df=pd.DataFrame(data['data'])df.to_excel('gov.xlsx')