delor's notes

Question

Napisać program wyświetlający na standardowym wyjściu plik zadany w wierszu poleceń.

Answer 1

import sys

file = sys.argv[1]
file = open(file)
sys.stdout.write(file.read())
file.close()

Answer 2

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys


try:
    source_file = sys.argv[1]
    destintion_file = sys.argv[2]

    source_file = open(source_file, 'r')
    destintion_file = open(destintion_file, 'w')

    destintion_file.write(source_file.read())
except IndexError, err:
    print >> sys.stderr, err
except IOError, err:
    print >> sys.stderr, err

Answer 3

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys


genres = { 0: 'Blues', 1:'Classic Rock', 2: 'Country', 3: 'Dance', 4: 'Disco',
          5: 'Funk', 6: 'Grunge', 7: 'Hip-Hop', 8: 'Jazz', 9: 'Metal',
          10: 'New Age', 11: 'Oldies', 12: 'Other', 13: 'Pop', 14: 'R&B',
          15: 'Rap', 16: 'Reggae', 17: 'Rock', 18: 'Techno', 19: 'Industrial',
          20: 'Alternative', 21: 'Ska', 22: 'Death Metal', 23: 'Pranks',
          24: 'Soundtrack', 25: 'Euro-Techno', 26: 'Ambient', 27: 'Trip-Hop',
          28: 'Vocal', 29: 'Jazz+Funk', 30: 'Fusion', 31: 'Trance',
          32: 'Classical', 33: 'Instrumental', 34: 'Acid', 35: 'House',
          36: 'Game', 37: 'Sound Clip', 38: 'Gospel', 39: 'Noise',
          40: 'AlternRock', 41: 'Bass', 42: 'Soul', 43: 'Punk', 44: 'Space',
          45: 'Meditative', 46: 'Instrumental Pop', 47: 'Instrumental Rock',
          48: 'Ethnic', 49: 'Gothic', 50: 'Darkwave', 51: 'Techno-Industrial',
          52: 'Electronic', 53: 'Pop-Folk', 54: 'Eurodance', 55: 'Dream',
          56: 'Southern Rock', 57: 'Comedy', 58: 'Cult', 59: 'Gangsta',
          60: 'Top 40', 61: 'Christian Rap', 62: 'Pop/Funk', 63: 'Jungle',
          64: 'Native American', 65: 'Cabaret', 66: 'New Wave',
          67: 'Psychadelic', 68: 'Rave', 69: 'Showtunes', 70: 'Trailer',
          71: 'Lo-Fi', 72: 'Tribal', 73: 'Acid Punk', 74: 'Acid Jazz',
          75: 'Polka', 76: 'Retro', 77: 'Musical', 78: 'Rock & Roll',
          79: 'Hard Rock' }

try:
    mp3_file = sys.argv[1]
    mp3_file = open(mp3_file)
    mp3_file.seek(-128, 2)
    #print mp3_file.read(128)
    #sys.exit(1)
    tag = mp3_file.read(3)
    print tag
    if tag in ('TAG', 'ID3'):
        tag = {}
        tag['title'] = mp3_file.read(30).strip()
        tag['artist'] = mp3_file.read(30).strip()
        tag['album'] = mp3_file.read(30).strip()
        tag['year'] = mp3_file.read(4).strip()
        tag['comment'] = mp3_file.read(30).strip()
        genre = ord(mp3_file.read(1))
        try:
            tag['genre'] = genres[genre]
        except KeyError:
            tag['genre'] = 'undefined/unknown'
        print tag
        print """
        title = %(title)s
        artist = %(artist)s
        album = %(album)s
        year = %(year)s
        comment = %(comment)s
        genre = %(genre)s
        """ % tag

except IndexError, err:
    print err
except IOError, err:
    print err

Answer 4

import sys

print 'nazwa programu:', sys.argv[0]
ilosc_argumentow = len(sys.argv)
for numer in range(1, ilosc_argumentow):
    print 'argument nr %i: %s' % (numer, sys.argv[numer])

Answer 5

import sys
import os

for zmienna in sys.argv[1:]:
    try:
        print '%s=%s' % (zmienna, os.environ[zmienna])
    except KeyError, err:
        print >> sys.stderr, 'zmienna %s nie jest ustawiona' % err
        sys.exit(1)

Answer 6

def nwd(a, b):
    while b:
        a, b = b, a%b
    return a

delor's notes

Mądrości

Obsługa wejścia/wyjścia i systemu plików

Argumenty wiersza poleceń i zmienne środowiskowe

Zadania

Wstęp do programowania w języku Python

Python — uruchamianie interpretera

Python — specyfika języka

Zadania

Test

code generated with pyments