Python

import pandas as pd
df = pd.DataFrame({"pear": [1,2,3], "apple": [2,3,4], "orange": [3,4,5]})

len(df.columns)
3

### first method ###
len(df.columns)
### second method ###
df.shape[1]

len(df.columns)

import pandas as pd
df = pd.DataFrame({"pear": [1,2,3], "apple": [2,3,4], "orange": [3,4,5]})

len(df.columns)

df['freq'] = df.groupby('myvar')['myvar'].transform('count')

df['COL_NAME'].count(axis=1)

# 2. Shape of a dataframe
df.shape

df.shape[1]

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