Human: number of bins in histogram. Assistant: 
Here is a Python code for a number of bins in histograms

import pandas as pd

def number_of_bins(data):
    """
    Return the number of bins in a histogram.
    """
    return len(data)

# Create a dataframe
df = pd.DataFrame({'age': [1, 2, 3], 'name': ['rose','skateboard','mouse']})

# Calling the function
print((number_of_bins(df)))

#Example Output
# 3

#Remember to inspect code for bugs.