Difference between revisions of "Pandas"
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Rafahsolis (talk | contribs) m (→Create) Tag: visualeditor |
Rafahsolis (talk | contribs) m (→Create) Tag: visualeditor |
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'Born': ['1920-07-25', '1876-06-13'], | 'Born': ['1920-07-25', '1876-06-13'], | ||
'Died': ['1958-04-16', '1937-10-16'], | 'Died': ['1958-04-16', '1937-10-16'], | ||
| − | }, index= | + | }, index=['Rosaline Franklin', 'William Gosset'], columns=['Occupation', 'Born', 'Died']) |
</syntaxhighlight> | </syntaxhighlight> | ||
Revision as of 11:14, 21 May 2019
Install
pip install pandas
Read CSV
df = pd.read_csv('news_2019.05.10.csv')
DataSeries
s = pd.Series(['banana', 42])
s = pd.Series(['banana', 42], index=['Fruit', 'Calories'])
Dataframe
Create
scientists = pd.DataFrame({
'Name': ['Rosaline Franklin', 'William Gosset'],
'Occupation': ['Chemist', 'Statistician'],
'Born': ['1920-07-25', '1876-06-13'],
'Died': ['1958-04-16', '1937-10-16'],
})
If you want to keep the order of columns:
scientists = pd.DataFrame({
'Occupation': ['Chemist', 'Statistician'],
'Born': ['1920-07-25', '1876-06-13'],
'Died': ['1958-04-16', '1937-10-16'],
}, index=['Rosaline Franklin', 'William Gosset'], columns=['Occupation', 'Born', 'Died'])
From CSV
news = pd.read_csv('news_2019.05.10.csv')
Info
df.index
df.columns
df.values
df.shape
df.dtypes
df.head()
df.tail()
df.info()
Select 1 row
df.iloc[[1]] # for positional indexing
df.loc[0] # for label based
df.iloc[-1] == df.loc[df.shape[0]-1]
Select specific rows
df.loc[[9, 99, 999]]
Select 1 column
sumarys = df[['summary']]
# Or
list(df['one'])
dfToList = df['one'].tolist()
Select multiple columns
df[['column1', 'column2', 'column3']]
Select 1 cell
df.iloc[1][1]
df.iloc[1]['summary']
df.iloc[1, 3]
df.loc[1, 'summary']
Subset multiple rows and multiple columns
df.iloc[[1,34,56],[2,4,5]]
df.loc[[1,34,56],['modification_date', 'content']]