Improve according to comments

pipenv/project.py

@@ -595,8 +595,9 @@ class Project(object):
         """Get the equivalent package name in pipfile"""
         key = 'dev-packages' if dev else 'packages'
         section = self.parsed_pipfile.get(key, {})
+        package_name = pep423_name(package_name)
         for name in section.keys():
-            if pep423_name(name) == pep423_name(package_name):
+            if pep423_name(name) == package_name:
                 return name
         return None
 
@@ -626,11 +627,11 @@ class Project(object):
         package = convert_deps_from_pip(package_name)
         package_name = [k for k in package.keys()][0]
         name = self.get_package_name_in_pipfile(package_name, dev)
-        if name and name != package_name:
-            # Replace the packge name
-            del p[key][name]
+        if name and converted == '*':
+            # Skip for wildcard version
+            return
         # Add the package to the group.
-        p[key][package_name] = package[package_name]
+        p[key][name or package_name] = package[package_name]
         # Write Pipfile.
         self.write_toml(p)
 

tests/test_pipenv.py

@@ -592,13 +592,13 @@ tpfd = "*"
 
     @pytest.mark.install
     @pytest.mark.run
-    def test_pep423_name_install(self, pypi):
+    def test_normalize_name_install(self, pypi):
         with PipenvInstance(pypi=pypi) as p:
             with open(p.pipfile_path, 'w') as f:
                 contents = """
 # Pre comment
 [packages]
-python_DateUtil = "*"   # Inline comment
+Requests = "==2.14.0"   # Inline comment
 """
                 f.write(contents)
 
@@ -607,18 +607,21 @@ python_DateUtil = "*"   # Inline comment
 
             c = p.pipenv('install requests')
             assert c.return_code == 0
-            assert 'python_DateUtil' in p.pipfile['packages']
-            c = p.pipenv('install python_dateutil')
+            assert 'requests' not in p.pipfile['packages']
+            assert p.pipfile['packages']['Requests'] == '==2.14.0'
+            c = p.pipenv('install requests==2.18.4')
+            assert c.return_code == 0
+            assert p.pipfile['packages']['Requests'] == '==2.18.4'
+            c = p.pipenv('install python_DateUtil')
             assert c.return_code == 0
             assert 'python-dateutil' in p.pipfile['packages']
-            assert 'python_DateUtil' not in p.pipfile['packages']
             contents = open(p.pipfile_path).read()
             assert '# Pre comment' in contents
             assert '# Inline comment' in contents
 
     @pytest.mark.uninstall
     @pytest.mark.run
-    def test_pep423_name_uninstall(self, pypi):
+    def test_normalize_name_uninstall(self, pypi):
         with PipenvInstance(pypi=pypi) as p:
             with open(p.pipfile_path, 'w') as f:
                 contents = """