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Converts Python source to C#

pytocs is a command line tool I wrote as a hobby project to convert Python source code to C#. I've uploaded it here in case someone finds it useful.

How to run pytocs

Just git clone the project, and use Visual Studio or MSBuild to compile the pytocs.sln file. If you're unable or unwilling to build pytocs from source, the latest continuous integration build is available at


To convert a Python file, hand it to pytocs:


To convert all files in a directory (recursively), use the -r parameter:

pytocs -r 

The following python fragment:

# Some code below
def hello():
   print "Hello World";

Translates to:

public static class hello {

    public static object hello() {
	    Console.WriteLine("Hello World");

A more ambitious sample:

class MyClass:
    # member function calling other function
    def calc_sum(self, x, y):
       return self.frobulate('+', x, y)

    # arithmetic and exceptions
    def frobulate(self, op, x, y):
        if op == '+':
            return x + y
        elif op == '-':
            return x - y
            raise ValueError("Unexpected argument %s" % op)

    # static method using and enumerate, with tuple comprehension
    def walk_list(lst):
        for (i,strg) in lst.iterate():
            print "index: %d strg: %s\n" % (i, strg)
    # list comprehension, generating linQ output.
    def apply_map(mapfn, filterfn):
        return [mapfn(n) for n in lst if filterfn]

Translates to:

using System;

using System.Linq;

public static class readme {
    public class MyClass {
        // member function calling other function
        public virtual object calc_sum(object x, object y) {
            return this.frobulate("+", x, y);
        // arithmetic and exceptions
        public virtual object frobulate(object op, object x, object y) {
            if (op == "+") {
                return x + y;
            } else if (op == "-") {
                return x - y;
            } else {
                throw new ValueError(String.Format("Unexpected argument %s", op));
        // static method using and enumerate, with tuple comprehension
        public static object walk_list(object lst) {
            foreach (var _tup_1 in lst.iterate()) {
                var i = _tup_1.Item1;
                var strg = _tup_1.Item2;
                Console.WriteLine(String.Format("index: %d strg: %s\n", i, strg));
        // list comprehension
        public static object apply_map(object mapfn, object filterfn) {
            return (from n in lst
                where filterfn
                select mapfn(n)).ToList();


The next big items on the list are:

  • Take the types that are inferred and apply them to the code to get away from everything being object.
  • Place local variable declarations at the statement that dominates all definitions of said variables.