Difference between revisions of "Pandas"
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[[Category:Python]] | [[Category:Python]] | ||
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Latest revision as of 21:28, 12 February 2022
Install[edit]
pip install pandas
Read CSV[edit]
df = pd.read_csv('news_2019.05.10.csv')
DataSeries[edit]
s = pd.Series(['banana', 42])
s = pd.Series(['banana', 42], index=['Fruit', 'Calories'])
s.values
s.keys()
s.values[0]
s.keys()[0]
s.min()
s.max()
s.std()
Dataframe[edit]
Create[edit]
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[edit]
news = pd.read_csv('news_2019.05.10.csv')
Info[edit]
df.index
df.columns
df.values
df.shape
df.dtypes
df.head()
df.tail()
df.info()
df.describe()
Select 1 row[edit]
df.iloc[[1]] # for positional indexing
df.loc[0] # for label based
df.iloc[-1] == df.loc[df.shape[0]-1]
Select specific rows[edit]
df.loc[[9, 99, 999]]
Select 1 column[edit]
sumarys = df[['summary']]
# Or
list(df['one'])
dfToList = df['one'].tolist()
Select multiple columns[edit]
df[['column1', 'column2', 'column3']]
Select 1 cell[edit]
df.iloc[1][1]
df.iloc[1]['summary']
df.iloc[1, 3]
df.loc[1, 'summary']
Subset multiple rows and multiple columns[edit]
df.iloc[[1,34,56],[2,4,5]]
df.loc[[1,34,56],['modification_date', 'content']]