<human>:  Python code to replace characters in between % %.
<bot>:

# Enter the text
text = "This is a test"

# Enter the start and end
start = 1
end = 5

# Enter the replacement
replacement = "This is a test"

# Calling the function
print((replace_in_between(text, start, end, replacement)))

#Example Output
# TThis is a testis a test

#Remember to inspect code for bugs.