pandas df index code example

Example 1: pandas index

How to add index to the DataFrame at runtime

df["patient"] = ["patient-" + str( i ) for i in range( max( df.index ) + 1  )]
df.set_index( "patient", inplace=True )
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patient = pandas.Series( ["patient-" + str( i ) for i in range( max( df.index ) + 1 )] )
df.index = patient
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df.index = ["patient-" + str( i ) for i in range( max( df.index ) + 1 )]

Example 2: select columns in pandas df

In [8]: age_sex = titanic[["Age", "Sex"]]

In [9]: age_sex.head()
Out[9]: 
    Age     Sex
0  22.0    male
1  38.0  female
2  26.0  female
3  35.0  female
4  35.0    male

Example 3: df.index

The index (row labels) of the DataFrame.