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@rg3915
Last active December 15, 2021 18:51
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Annotations of Pandas DataFrame
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@rg3915
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rg3915 commented Sep 12, 2019

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rg3915 commented Nov 6, 2019

dtype example
df['estoque'] =df['estoque'].fillna(0).astype(int)

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rg3915 commented Nov 6, 2019

Pandas Dataframe df to Django
https://www.laurivan.com/save-pandas-dataframe-as-django-model/

Produto.objects.bulk_create(
    Produto(**item) for item in df.to_dict('records')
)

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rg3915 commented Nov 13, 2019

Definindo os tipos das colunas com dtype

dict_types_annot = {
    'produto': str,
    'ncm': str,
    'preco': float,
    'estoque': 'Int64',
}

# Define os tipos das colunas
dff = df.astype(dict_types_annot, errors='ignore')

# Troca 'nan' por None e float por None.
dff = dff.replace({'nan': None, float('nan'): None})

dff.to_dict('records')

Produto.objects.bulk_create(
    Produto(**item) for item in dff.to_dict('records')
)

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rg3915 commented Jan 22, 2020

Intersecção de dataframes

import pandas as pd
import numpy as np
import datetime
from random import randint

df1 = pd.DataFrame({
    'letters': ['A', 'B', 'C', 'D', 'E', 'J', 'K', 'M'],
    'B': np.random.randint(0, 10, 8),
})
df1

df2 = pd.DataFrame({
    'letters': ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'U', 'Z'],
    'B': np.random.randint(0, 10, 26),
})
df2

# Retorna o que tem de comum nos dois dataframes.
pd.merge(df1, df2, how='inner', on='fruits')

# Retorna o que tem de comum, considerando o df1.
pd.merge(df1, df2, how='left', on='fruits')

# Retorna o que tem de comum, considerando o df2.
pd.merge(df1, df2, how='right', on='fruits')

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