Mahdi Kooshkbaghi Mahdi Kooshkbaghi - 1 year ago 106
Python Question

Reading default output of Fortran in Python

I have an output from old code in Fortran 77. The output is written with


line. So basically, default format. Following is part of output:

1.25107598E-67 1.89781536E-61 1.28064971E-94 5.85754394-118 8.02718071E-94

I had a post-processing tool written in F77 and
read the input file correctly as:

1.25107598000000E-67 1.89781536000000E-61 1.28064971000000E-94 5.85754394000000E-118 8.02718071000000E-94

The problematic number is
It will read correctly as it means
in F77.

However, now I wrote a post-processing in python and I have a following line of code:

Z = numpy.fromstring(lines[nl], dtype=float, sep=' ')

which will read an output line by line (through loop on
But when it reaches the
number it will stop reading, going to the next line of output and basically reading wrong number. Is there any way to read it in a correct way (default way of Fortran)?
I will guess I need to change
option but not have any clue.

Answer Source

You can post-process your output efficiently with a regular expression:

import re

r = re.compile(r"(?<=\d)\-(?=\d)")

output_line = "1.25107598E-67  1.89781536E-61  1.28064971E-94  5.85754394-118  8.02718071E-94 "


1.25107598E-67  1.89781536E-61  1.28064971E-94  5.85754394E-118  8.02718071E-94 

(?<=\d)\-(?=\d) performs a lookbehind and lookahead for digits, and search for single minus sign between them. It replaces the minus sign by E-.

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