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Annotations of Pandas DataFrame
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FromDict.ipynb
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gen_names_xlsx.ipynb
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gen_random_values.ipynb
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import_xlsx_to_django_database.ipynb
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import_xlsx_to_django_database2.ipynb
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OrcamentosNumOrcNovo.ipynb
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pandas.ipynb
{
"cells": [
{
"cell_type": "code",
"execution_count": 1,
"metadata": {},
"outputs": [],
"source": [
"import pandas as pd\n",
"filename = '/home/dev/fix/348670_ion_annotations.tsv'"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {},
"outputs": [],
"source": [
"df = pd.read_csv(filename, sep='\\t')"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {},
"outputs": [
{
"data": {
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],
"text/plain": [
" chrom pos _id ref alt qual filter alt_pos_strand dbsnp_bin \\\n",
"0 4 0 19 1 1 0 4 1 0 \n",
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"10 5 0 19 1 1 0 4 1 0 \n",
"11 5 0 19 1 1 0 4 1 0 \n",
"12 5 0 19 1 1 0 4 1 0 \n",
"\n",
" dbsnp_chrom ... gnomad_an_popmax gnomad_af_popmax \\\n",
"0 4 ... 0 0 \n",
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"3 5 ... 0 0 \n",
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"\n",
" gnomad_dp_median gnomad_dref_median gnomad_gq_median gnomad_ab_median \\\n",
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"\n",
" gnomad_as_rf gnomad_as_filterstatus fdvr hs_only \n",
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"\n",
"[13 rows x 265 columns]"
]
},
"execution_count": 3,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"# Como ver o tamanho de todos os campos\n",
"df.applymap(lambda el: len(el) if isinstance(el, str) else 0)"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": []
}
],
"metadata": {
"kernelspec": {
"display_name": "Django Shell-Plus",
"language": "python",
"name": "django_extensions"
},
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"version": 3
},
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"name": "python",
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}
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remove_duplicated.ipynb
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separe_email.ipynb
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@paulochf
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paulochf commented Jul 16, 2018 •
edited
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Código que substitui da célula [6] em diante do separe_email.ipynb:

emails_df = df.email_.str.split(";").apply(pd.Series).stack().reset_index(level=1, drop=True).to_frame('emails')

dffinal = df.drop("email_", axis=1).merge(emails_df, left_index=True, right_index=True)

Um detalhe é a falta de um índice único dos registros. Então, supondo o índice automático decorrente da importação do arquivo Excel como ID válido, esse ID é o usado no "join" (merge).

@rg3915
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rg3915 commented Aug 1, 2018

Para transformar Query do Django em DataFrame:
df = pd.DataFrame(list(User.objects.all().values()))

@rg3915
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rg3915 commented Aug 1, 2018

Pra mostrar somente algumas colunas:
df[['id', 'email']]

@rg3915
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rg3915 commented Aug 28, 2018

Transformando todos os campos do DataFrame num jSON
df.T.apply(dict).tolist()

@rg3915
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rg3915 commented Aug 28, 2018

Renomeando colunas
df.rename(columns={'old_name': 'new_name'})

@rg3915
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rg3915 commented Aug 28, 2018

Selecionando as colunas de 10 em 10
df.iloc[:, :10]
com transposição
df.T.iloc[:10]

@rg3915
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rg3915 commented Oct 11, 2018

Novo df com algumas colunas.
new = old.filter(['A','B','D'], axis=1)

@rg3915
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rg3915 commented Oct 12, 2018

Como não inserir chaves com valor nulo no dicionário:
df.T.apply(lambda x: dict(x.dropna())).tolist()

@rg3915
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rg3915 commented Oct 17, 2018

Retornando os valores cujo tamanho da string seja maior que...
df[df['foo'].str.len() > 50]['foo']

Mostrando o tamanho de cada célula
df[df['foo'].str.len() > 50]['foo'].str.len()

@rg3915
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rg3915 commented Nov 9, 2018 •
edited
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Mostrando o tamanho de cada célula da coluna

df['foo_len'] = df['foo'].apply(len)
df[['foo_len', 'foo']]

Ou

df['foo'].str.len()

@rg3915
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rg3915 commented Dec 5, 2018

Suponha que você tenha Cliente e Obra.

Pegando o ID do Cliente que está em Obra e trocando pelo nome do Cliente que está no outro DataFrame.

# JSON do Cliente com IDCliente e Cliente
dict_cliente = df_cliente[['IDCliente', 'Cliente']].T.apply(dict).tolist()

[
 {'IDCliente': 288, 'Cliente': 'Cliente Um'},
 {'IDCliente': 1, 'Cliente': 'Cliente Dois'},
 {'IDCliente': 959, 'Cliente': 'Cliente Três'},
]

Montando o dicionário que será usado como busca de cada Cliente a partir do seu ID.

_dict_cliente = {}
for item in dict_cliente:
    _dict_cliente[item['IDCliente']] = item['Cliente']

_dict_cliente

{
 288: 'Cliente Um',
 1: 'Cliente Dois',
 959: 'Cliente Três',
}

A partir desse dicionário fazemos a busca no outro DataFrame.

for row in df.itertuples():
    nome_cliente = _dict_cliente.get(row.IDCliente)
    print(row.IDCliente, nome_cliente)

288 Cliente Um
1   Cliente Dois
959 Cliente Três

@rg3915
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rg3915 commented Dec 9, 2018 •
edited
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Retornando o valor máximo agrupado por ano.

df.groupby(['Ano'])['NumeroOrcamento'].max()
df.reset_index()

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rg3915 commented Dec 10, 2018

Verificando data vazia:

for row in df.itertuples():
    if row.DataOrcamento is pd.NaT:
        print('Vazio')
    else:
        print(row.DataOrcamento)

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rg3915 commented Dec 16, 2018

Definindo vários fillna diferentes por coluna:

values = {'last_name': '', 'occupation': '', 'age': 0}
df = df.fillna(value=values)
df.head()

@rg3915
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rg3915 commented Aug 6, 2019

Se tiver problema com liblzma, faça um downgrade do Pandas para pandas==0.24.2.
https://stackoverflow.com/a/57115325

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rg3915 commented Aug 6, 2019

Retorna o tamanho do maior objeto de cada coluna.

dict_sizes = {}
for col in df.columns:
    try:
        print(f'{col} max length: {df[col].map(len).max()}\n')
        dict_sizes[col] = df[col].map(len).max()
    except Exception as e:
        raise e
dict_sizes

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rg3915 commented Sep 12, 2019

from_dict doc

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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')
)

@rg3915
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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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