pandas count duplicate values in column code example

Example 1: print duplicates elements in column pandas

mask = df.columnname.duplicated(keep=False)
print (df[mask])

Example 2: how to check for duplicates in a column in python

boolean = df['Student'].duplicated().any() # True

Example 3: count duplicates in one column pandas

df.pivot_table(index=['DataFrame Column'], aggfunc='size')