support omit package output version

README.rst

@@ -49,6 +49,7 @@ Usage
         --force               Overwrite existing requirements.txt
         --diff <file>         Compare modules in requirements.txt to project imports.
         --clean <file>        Clean up requirements.txt by removing modules that are not imported in project.
+        --no-pin              Omit version of output packages.
 Example
 -------
 

pipreqs/pipreqs.py

@@ -31,6 +31,7 @@ Options:
                           imports.
     --clean <file>        Clean up requirements.txt by removing modules
                           that are not imported in project.
+    --no-pin              Omit version of output packages.
 """
 from __future__ import print_function, absolute_import
 from contextlib import contextmanager
@@ -447,6 +448,9 @@ def init(args):
                         "use --force to overwrite it")
         return
 
+    if args.get('--no-pin'):
+        imports = [{'name': item["name"], 'version': ''} for item in imports]
+
     if args["--print"]:
         output_requirements(imports)
         logging.info("Successfully output requirements")

tests/test_pipreqs.py

@@ -181,6 +181,24 @@ class TestPipreqs(unittest.TestCase):
             for item in ['click', 'getpass']:
                 self.assertFalse(item.lower() in data)
 
+    def test_omit_version(self):
+        """
+        Test --no-pin parameter
+        """
+        pipreqs.init(
+            {'<path>': self.project_with_ignore_directory, '--savepath': None, '--print': False,
+             '--use-local': None, '--force': True,
+             '--proxy': None,
+             '--pypi-server': None,
+             '--diff': None,
+             '--clean': None,
+             '--no-pin': True
+             }
+        )
+        with open(os.path.join(self.project_with_ignore_directory, "requirements.txt"), "r") as f:
+            data = f.read().lower()
+            for item in ['beautifulsoup4==4.8.1', 'boto==2.49.0']:
+                self.assertFalse(item.lower() in data)
 
     def tearDown(self):
         """