Dvorak-QWERTY Converter

dvqw.py

#!/usr/bin/python3
# translate dvorak to qwetry and vice versa
# thank you, tr; you're useless to me!
# usage:
#  run it, and input a line of dvorak-encoded text, then press enter to get the qwerty-decoded one
#  run it with any argument, and input a line of qwerty, then press enter to get dvorak

h = {}

h[']'] = '/';  h['}'] = '+'
h['['] = '=';  h['{'] = '?'
h['='] = ']';  h['+'] = '}'
h['/'] = '[';  h['?'] = '{'
h['l'] = 'p';  h['L'] = 'P'
h['r'] = 'o';  h['R'] = 'O'
h['c'] = 'i';  h['C'] = 'I'
h['g'] = 'u';  h['G'] = 'U'
h['f'] = 'y';  h['F'] = 'Y'
h['y'] = 't';  h['Y'] = 'T'
h['p'] = 'r';  h['P'] = 'R'
h['.'] = 'e';  h['>'] = 'E'
h[','] = 'w';  h['<'] = 'W'
h["'"] = 'q';  h['"'] = 'Q'
h['-'] = "'";  h['_'] = '"'
h['s'] = ';';  h['S'] = ':'
h['n'] = 'l';  h['N'] = 'L'
h['t'] = 'k';  h['T'] = 'K'
h['h'] = 'j';  h['H'] = 'J'
h['d'] = 'h';  h['D'] = 'H'
h['i'] = 'g';  h['I'] = 'G'
h['u'] = 'f';  h['U'] = 'F'
h['e'] = 'd';  h['E'] = 'D'
h['o'] = 's';  h['O'] = 'S'
h['a'] = 'a';  h['A'] = 'A'
h['z'] = '/';  h['Z'] = '?'
h['v'] = '.';  h['V'] = '>'
h['w'] = ',';  h['W'] = '<'
h['m'] = 'm';  h['M'] = 'M'
h['b'] = 'n';  h['B'] = 'N'
h['x'] = 'b';  h['X'] = 'B'
h['k'] = 'v';  h['K'] = 'V'
h['j'] = 'c';  h['J'] = 'C'
h['q'] = 'x';  h['Q'] = 'X'
h[';'] = 'z';  h[':'] = 'Z'

import sys
if len(sys.argv) > 1: # any args are given
  d = dict((v,k) for k,v in h.items())
  # http://stackoverflow.com/questions/3221475/reverse-mapping-of-dictionary-with-python
else:
  d = h

a = input()
for i in a:
  if i in d:
    print(d[i], end='')
  else:
    print(i, end='')

print()

See also: https://en.wikipedia.org/wiki/Dvorak_encoding and https://github.com/Osndok/dv ;)