Mcucpp

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def which(program):
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	import os
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	def is_exe(fpath):
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		return os.path.isfile(fpath)  
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	fpath, fname = os.path.split(program)
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	if fpath:
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		if is_exe(program):
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			return program
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	else:
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		for path in os.environ["PATH"].split(os.pathsep):
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			path = path.strip('"')
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			exe_file = os.path.join(path, program)
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			if is_exe(exe_file):
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				return exe_file
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			if is_exe(exe_file + ".exe"):
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				return exe_file + ".exe"
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	return None