Reverse humanize (#965)

* changes

* Added test cases

* Added more langauges

* Added more langauge test cases and simplified code

* fixed merge issue with locales.py

* Added additional locales to test case files

* changes

* Added test cases

* Added more langauges

* Added more langauge test cases and simplified code

* fixed merge issue with locales.py

* Added additional locales to test case files

* Added comments as per style guide. Added more input validation and input validation test cases. Implemented fixes as per discussion.

* Fixed issue with failed Bengali test case

* Grammar errors in comments and error messages fixed.

* Added Dehumanize information to index.rst

* Edited Dehumaize documentation in index.rst to be more clear

* Fixed linting issue with docs

* Updated error in the documentation, as well as changed value error strings to format better

* Fixed typo in dehumanize doc

* White space error fixed

arrow/arrow.py

@@ -1312,14 +1312,14 @@ def dehumanize(self, timestring: str, locale: str = "en_us") -> "Arrow":
                 >>> arw = arrow.utcnow()
                 >>> arw
                 <Arrow [2021-04-20T22:27:34.787885+00:00]>
-                >>> earlier = arw.dehumanize("two days ago")
+                >>> earlier = arw.dehumanize("2 days ago")
                 >>> earlier
                 <Arrow [2021-04-18T22:27:34.787885+00:00]>
 
                 >>> arw = arrow.utcnow()
                 >>> arw
                 <Arrow [2021-04-20T22:27:34.787885+00:00]>
-                >>> later = arw.dehumanize("in 1 month")
+                >>> later = arw.dehumanize("in a month")
                 >>> later
                 <Arrow [2021-05-18T22:27:34.787885+00:00]>
 
@@ -1393,8 +1393,8 @@ def dehumanize(self, timestring: str, locale: str = "en_us") -> "Arrow":
         # Assert error if string does not modify any units
         if not any([True for k, v in unit_visited.items() if v]):
             raise ValueError(
-                """Input string not valid. Note: Some locales do not support the week granulairty in Arrow.
-                 If you are attempting to use the week granularity on an unsupported locale, this could be the cause of this error."""
+                "Input string not valid. Note: Some locales do not support the week granulairty in Arrow. "
+                "If you are attempting to use the week granularity on an unsupported locale, this could be the cause of this error."
             )
 
         # Sign logic
@@ -1418,9 +1418,9 @@ def dehumanize(self, timestring: str, locale: str = "en_us") -> "Arrow":
             sign_val = 0
         else:
             raise ValueError(
-                """Invalid input String. String does not contain any relative time information.
-                String should either represent a time in the future or a time in the past.
-                Ex: "in 5 seconds" or "5 seconds ago". """
+                "Invalid input String. String does not contain any relative time information. "
+                "String should either represent a time in the future or a time in the past. "
+                "Ex: 'in 5 seconds' or '5 seconds ago'."
             )
 
         time_changes = {k: sign_val * v for k, v in time_object_info.items()}

docs/index.rst

@@ -262,7 +262,7 @@ Take a human readable string and use it to shift into a past time:
     >>> arw = arrow.utcnow()
     >>> arw
     <Arrow [2021-04-20T22:27:34.787885+00:00]>
-    >>> earlier = arw.dehumanize("two days ago")
+    >>> earlier = arw.dehumanize("2 days ago")
     >>> earlier
     <Arrow [2021-04-18T22:27:34.787885+00:00]>
 
@@ -273,7 +273,7 @@ Or use it to shift into a future time:
     >>> arw = arrow.utcnow()
     >>> arw
     <Arrow [2021-04-20T22:27:34.787885+00:00]>
-    >>> later = arw.dehumanize("in 1 month")
+    >>> later = arw.dehumanize("in a month")
     >>> later
     <Arrow [2021-05-18T22:27:34.787885+00:00]>