ArcGIS desktop won't import arcpy

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I have arcgis 10.3 and I am trying to run a task using python but the python window within arcmap won't import arcpy. This never happened to me with 10.2.2. The error returned is:

Runtime error Traceback (most recent call last): File "", line 1, in File "c:\program files (x86)\arcgis\desktop10.3\arcpy\arcpy\__init__.py", line 24, in from arcpy.toolbox import * File "c:\program files (x86)\arcgis\desktop10.3\arcpy\arcpy\toolbox.py", line 15, in from .ddd import ASCII3DToFeatureClass as ASCII3DToFeatureClass_3d File "c:\program files (x86)\arcgis\desktop10.3\arcpy\arcpy\ddd.py", line 23, in from arcpy.arcobjects.arcobjectconversion import convertArcObjectToPythonObject File "c:\program files (x86)\arcgis\desktop10.3\arcpy\arcpy\arcobjects\__init__.py", line 19, in arcobjectconversion.initialize_conversion_mapping() File "c:\program files (x86)\arcgis\desktop10.3\arcpy\arcpy\arcobjects\arcobjectconversion.py", line 26, in initialize_conversion_mapping from .._mapping import MapDocument, PageLayout, DataFrame, DataFrameTime, DataDrivenPages, \ File "c:\program files (x86)\arcgis\desktop10.3\arcpy\arcpy\_mapping.py", line 19, in from arcpy.utils import logcall, ArgAdaptor File "c:\program files (x86)\arcgis\desktop10.3\arcpy\arcpy\utils.py", line 17, in import inspectImportError: No module named inspect

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