The declaration errors='replace' works from within IDLE but not at the Windows command line. I am attaching a program and text file that demonstrate the problem. The error shows up at the Windows command line as follows:

C:\Users\John\Documents\Python\bug_reports\001>python -m read_my_file
aaaaaaa aaaaaaaaaaaaa aaaaaaaaaaaaaaa aaaaaaaaa

bbbbbbbbbbb bbbbbbbbbbbb bbbbbbbbbbbbbbbbbbb bbbbbbbbbbbb

Traceback (most recent call last):
  File "C:\Python31\lib\runpy.py", line 128, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "C:\Python31\lib\runpy.py", line 34, in _run_code
    exec(code, run_globals)
  File "C:\Users\John\Documents\Python\bug_reports\001\read_my_file.py", line 20, in <module>
    readf()
  File "C:\Users\John\Documents\Python\bug_reports\001\read_my_file.py", line 17, in readf
    print(line)
  File "C:\Python31\lib\encodings\cp437.py", line 19, in encode
    return codecs.charmap_encode(input,self.errors,encoding_map)[0]
UnicodeEncodeError: 'charmap' codec can't encode characters in position 10-11: character maps to <undefined>


NOTE: It appears I can only attach 1 file to this report. So I am copying the program here. The text file to read is attached.

'''
read_my_file.py:
Reads lines from faulty file.
Hangs at line 3 when run from Windows command line.
Platforms:
Windows Vista Ultimate 64-bit
Python 3.1.2
'''
#The file to read.
my_file = 'junk.txt'

def readf():
	#The declaration "errors='replace'" is suppposed replace characters the reader does not recognize with a dummy character such as a question mark.
	#This fix works in the interpreter, but not from the Windows command line.
	fh_read = open(my_file, errors='replace')
	for line in fh_read:
		print(line)

#Run.
readf()