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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def run(cmd_str,cwd='.',verbose=False):
 """ an OS agnostic function to execute command Parameters cmd_str : str the str to execute with os.system() cwd : str the directory to execute the command in verbose : bool flag to echo to stdout complete cmd str Note ---- uses platform to detect OS and adds .exe or ./ as appropriate for Windows, if os.system returns non-zero, raises exception Example ------- """

    warnings.warn("run() has moved to pyemu.os_utils",PyemuWarning)
    pyemu.os_utils.run(cmd_str=cmd_str,cwd=cwd,verbose=verbose)