get_python_version_for_prefix in prefix_data.py doesn't handle two digit minor version

The function get_python_version_for_prefix silently truncates two digit minor version numbers. For example, if the Python version number is 3.10, it will return "3.1", which can cause some packages to be installed in the incorrect location.

Of course, there isn't a Python 3.10 yet -- I ran into this while experimenting. FWIW, the accepted PEP 602 suggests that 3.10 will be the version after 3.9 (as opposed to 4.0).

conda/conda/core/prefix_data.py

Lines 370 to 380 in 2cdd7ab

    
           def get_python_version_for_prefix(prefix): 
        
               # returns a string e.g. "2.7", "3.4", "3.5" or None 
        
               py_record_iter = (rcrd for rcrd in PrefixData(prefix).iter_records() if rcrd.name == 'python') 
        
               record = next(py_record_iter, None) 
        
               if record is None: 
        
                   return None 
        
               next_record = next(py_record_iter, None) 
        
               if next_record is not None: 
        
                   raise CondaDependencyError("multiple python records found in prefix %s" % prefix) 
        
               else: 
        
                   return record.version[:3]

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	def get_python_version_for_prefix(prefix):
	# returns a string e.g. "2.7", "3.4", "3.5" or None
	py_record_iter = (rcrd for rcrd in PrefixData(prefix).iter_records() if rcrd.name == 'python')
	record = next(py_record_iter, None)
	if record is None:
	return None
	next_record = next(py_record_iter, None)
	if next_record is not None:
	raise CondaDependencyError("multiple python records found in prefix %s" % prefix)
	else:
	return record.version[:3]

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