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import PIL,os, sys
from PIL import Image
 
infile = Image.open('C:/Users/myuser/Desktop/Untitled12.png')
 
for infile in sys.argv[1:]:
    f, e= os.path.splitext(infile)
    outfile = f + ".jpg"
    if infile != outfile:
        try:
            with Image.open(infile) as im:
                im.save(outfile)
        except OSError:
            print(f"Cannot convert {infile}")
 

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/py_compile.py", line 117, in compile
    raise py_exc
py_compile.PyCompileError:   File "prog.py", line 14
    print(f"Cannot convert {infile}")
                                   ^
SyntaxError: invalid syntax

Standard output is empty