Question regarding os.system

[mfkfx]

Hello,

I have a problem combining convert with Pythons os.system:

os.system("convert -pointsize 20 -fill yellow -draw "text 270,460 '$(date)'" image_tmp.jpg image.jpg")


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os.system("convert -pointsize 20 -fill yellow -draw "text 270,460 '$(date)'" image_tmp.jpg image.jpg")
                                                            ^
SyntaxError: invalid syntax

I think the reason is the amount of "" used in this line.

Can anyone help me with this?

Regards

[mutetella]

@mfkfx
`os.system` is deprecated since Python 2.6. If you must use it, escape the quotation marks:

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os.system("convert -pointsize 20 -fill yellow -draw \"text 270,406 '$(date)'\" image_tmp.jpg image.jpg")

Otherwise do it with the subprocess module:

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>>> date = subprocess.Popen(['date'], stdout=subprocess.PIPE).communicate()[0].strip()
>>> args = ['convert', '-pointsize', '20', '-fill', 'yellow', '-draw', 'text 270,460 "{}"'.format(date), 'image_tmp.jpg', 'image.jpg']
>>> subprocess.call(args)

[Sirius3]

and since Python has built in datetime formatting, you don't have to rely on an external program:

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import datetime
import subprocess
text = 'text 270,460 "{:%a %d %b %Y %H:%M:%S}"'.format(datetime.datetime.now())
subprocess.call(['convert', '-pointsize', '20', '-fill', 'yellow', '-draw', text, 'image_tmp.jpg', 'image.jpg'])

[BlackJack]

ImageMagick also has direct Python bindings for the shared libary (`libmagick++`). Install the bindings and you don't have to call external programs at all:

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#!/usr/bin/env python
# coding: utf-8
from __future__ import absolute_import, division, print_function
from datetime import datetime as DateTime
from PythonMagick import Image, DrawableText


def main():  
    image = Image('image_tmp.jpg')
    image.fontPointsize(20)
    image.fillColor('yellow')
    image.draw(
        DrawableText(270, 460, format(DateTime.now(), '%a %d %b %Y %H:%M:%S'))
    )
    image.write('image.jpg')


if __name__ == '__main__':
    main()

Another solution may be the „Python Imaging Library” (PIL) or its successor project „Pillow“.