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pythonfileindices

Find the line number containing a given span

Given a text file, how would one find the line number corresponding to given start and end indices for a substring? Even though the value of any given span can be found, the data set I'm working with contains duplicates.

Solution

  • line_number = my_string[:start_index].count("\n")

    I guess ...

    my_string = """
hello
test
line 
numbers
"""

print(my_string[:14].count("\n")) # the 14th character is the 3rd line