Python Pandas - Display the value of the start parameter of RangeIndex

To display the value of the start parameter of RangeIndex, use the index.start property in Pandas. RangeIndex is a memory-saving special case of Int64Index limited to representing monotonic ranges that can improve computing performance.

What is RangeIndex?

RangeIndex represents a monotonic integer range similar to Python's range() function. It stores only the start, stop, and step values instead of the entire sequence, making it memory-efficient for large ranges.

Creating a RangeIndex

You can create a RangeIndex by specifying start, stop, step, and an optional name ?

import pandas as pd

# Create a range index with start, stop and step
index = pd.RangeIndex(start=5, stop=20, step=2, name="data")

# Display the RangeIndex
print("RangeIndex...")
print(index)

RangeIndex...
RangeIndex(start=5, stop=20, step=2, name='data')

Accessing the Start Parameter

Use the start property to get the starting value of the RangeIndex ?

import pandas as pd

# Create a range index
index = pd.RangeIndex(start=5, stop=20, step=2, name="data")

# Display the start parameter value
print("RangeIndex start value:")
print(index.start)

# You can also access other parameters
print(f"Stop value: {index.stop}")
print(f"Step value: {index.step}")
print(f"Name: {index.name}")

RangeIndex start value:
5
Stop value: 20
Step value: 2
Name: data

Complete Example

Here's a comprehensive example showing RangeIndex creation and parameter access ?

import pandas as pd

# Create different RangeIndex objects
index1 = pd.RangeIndex(start=0, stop=10)
index2 = pd.RangeIndex(start=5, stop=20, step=2, name="custom_range")

# Display the indexes and their start values
print("Index 1:", index1)
print("Index 1 start:", index1.start)
print()
print("Index 2:", index2)
print("Index 2 start:", index2.start)

# Convert to list to see actual values
print("\nActual values in index2:", list(index2))

Index 1: RangeIndex(start=0, stop=10, step=1)
Index 1 start: 0

Index 2: RangeIndex(start=5, stop=20, step=2, name='custom_range')
Index 2 start: 5

Actual values in index2: [5, 7, 9, 11, 13, 15, 17, 19]

Conclusion

Use index.start to access the start parameter of a RangeIndex. RangeIndex is memory-efficient for large sequential ranges and provides easy access to its defining parameters through properties.