/
pandas_index.py
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/
pandas_index.py
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import pandas as pd
df = pd.read_csv('data/src/sample_pandas_normal.csv', index_col=0)
print(df)
# age state point
# name
# Alice 24 NY 64
# Bob 42 CA 92
# Charlie 18 CA 70
# Dave 68 TX 70
# Ellen 24 CA 88
# Frank 30 NY 57
print(df['age'])
print(type(df['age']))
# name
# Alice 24
# Bob 42
# Charlie 18
# Dave 68
# Ellen 24
# Frank 30
# Name: age, dtype: int64
# <class 'pandas.core.series.Series'>
print(df.age)
print(type(df.age))
# name
# Alice 24
# Bob 42
# Charlie 18
# Dave 68
# Ellen 24
# Frank 30
# Name: age, dtype: int64
# <class 'pandas.core.series.Series'>
print(df[['age', 'point']])
print(type(df[['age', 'point']]))
# age point
# name
# Alice 24 64
# Bob 42 92
# Charlie 18 70
# Dave 68 70
# Ellen 24 88
# Frank 30 57
# <class 'pandas.core.frame.DataFrame'>
print(df['age':'point'])
# Empty DataFrame
# Columns: [age, state, point]
# Index: []
print(df.loc[:, 'age':'point'])
print(type(df.loc[:, 'age':'point']))
# age state point
# name
# Alice 24 NY 64
# Bob 42 CA 92
# Charlie 18 CA 70
# Dave 68 TX 70
# Ellen 24 CA 88
# Frank 30 NY 57
# <class 'pandas.core.frame.DataFrame'>
print(df.iloc[:, [0, 2]])
print(type(df.iloc[:, [0, 2]]))
# age point
# name
# Alice 24 64
# Bob 42 92
# Charlie 18 70
# Dave 68 70
# Ellen 24 88
# Frank 30 57
# <class 'pandas.core.frame.DataFrame'>
print(df[1:4])
print(type(df[1:4]))
# age state point
# name
# Bob 42 CA 92
# Charlie 18 CA 70
# Dave 68 TX 70
# <class 'pandas.core.frame.DataFrame'>
print(df[::2])
print(type(df[::2]))
# age state point
# name
# Alice 24 NY 64
# Charlie 18 CA 70
# Ellen 24 CA 88
# <class 'pandas.core.frame.DataFrame'>
print(df[1::2])
print(type(df[1::2]))
# age state point
# name
# Bob 42 CA 92
# Dave 68 TX 70
# Frank 30 NY 57
# <class 'pandas.core.frame.DataFrame'>
# print(df[1])
# KeyError
print(df[1:2])
print(type(df[1:2]))
# age state point
# name
# Bob 42 CA 92
# <class 'pandas.core.frame.DataFrame'>
print(df['Bob':'Ellen'])
print(type(df['Bob':'Ellen']))
# age state point
# name
# Bob 42 CA 92
# Charlie 18 CA 70
# Dave 68 TX 70
# Ellen 24 CA 88
# <class 'pandas.core.frame.DataFrame'>
print(df.loc['Bob'])
print(type(df.loc['Bob']))
# age 42
# state CA
# point 92
# Name: Bob, dtype: object
# <class 'pandas.core.series.Series'>
print(df.loc[['Bob', 'Ellen']])
print(type(df.loc[['Bob', 'Ellen']]))
# age state point
# name
# Bob 42 CA 92
# Ellen 24 CA 88
# <class 'pandas.core.frame.DataFrame'>
print(df.iloc[[1, 4]])
print(type(df.iloc[[1, 4]]))
# age state point
# name
# Bob 42 CA 92
# Ellen 24 CA 88
# <class 'pandas.core.frame.DataFrame'>
s = df['age']
print(s)
# name
# Alice 24
# Bob 42
# Charlie 18
# Dave 68
# Ellen 24
# Frank 30
# Name: age, dtype: int64
print(s[3])
# 68
print(s[[1, 3]])
print(type(s[[1, 3]]))
# name
# Bob 42
# Dave 68
# Name: age, dtype: int64
# <class 'pandas.core.series.Series'>
print(s[1:3])
print(type(s[1:3]))
# name
# Bob 42
# Charlie 18
# Name: age, dtype: int64
# <class 'pandas.core.series.Series'>
print(s[[1]])
print(type(s[[1]]))
# name
# Bob 42
# Name: age, dtype: int64
# <class 'pandas.core.series.Series'>
print(s[1:2])
print(type(s[1:2]))
# name
# Bob 42
# Name: age, dtype: int64
# <class 'pandas.core.series.Series'>
print(s['Dave'])
# 68
print(s[['Bob', 'Dave']])
print(type(s[['Bob', 'Dave']]))
# name
# Bob 42
# Dave 68
# Name: age, dtype: int64
# <class 'pandas.core.series.Series'>
print(s['Bob':'Dave'])
print(type(s['Bob':'Dave']))
# name
# Bob 42
# Charlie 18
# Dave 68
# Name: age, dtype: int64
# <class 'pandas.core.series.Series'>
print(s[['Bob']])
print(type(s[['Bob']]))
# name
# Bob 42
# Name: age, dtype: int64
# <class 'pandas.core.series.Series'>
print(s['Bob':'Bob'])
print(type(s['Bob':'Bob']))
# name
# Bob 42
# Name: age, dtype: int64
# <class 'pandas.core.series.Series'>
s_i = s.reset_index(drop=True)
print(s_i)
# 0 24
# 1 42
# 2 18
# 3 68
# 4 24
# 5 30
# Name: age, dtype: int64
# print(s_i[-1])
# KeyError
print(s_i.iat[-1])
# 30
print(s[-1])
# 30
print(df['age']['Alice'])
# 24
print(df.age[0])
# 24
print(df['Bob':'Dave'][['age', 'point']])
print(type(df['Bob':'Dave'][['age', 'point']]))
# age point
# name
# Bob 42 92
# Charlie 18 70
# Dave 68 70
# <class 'pandas.core.frame.DataFrame'>