Per requirement global options (#4579)

* Stop using a mutable default value * 📰
pypa · Aug 2, 2017 · 573a501 · 573a501
1 parent 281061f
commit 573a501
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diff --git a/news/3830.bugfix b/news/3830.bugfix
@@ -0,0 +1 @@
+Requirement Files not longer pass global options from one package to later packages in the same file.
diff --git a/pip/req/req_install.py b/pip/req/req_install.py
@@ -720,8 +720,9 @@ def match_markers(self, extras_requested=None):
         else:
             return True
 
-    def install(self, install_options, global_options=[], root=None,
+    def install(self, install_options, global_options=None, root=None,
                 prefix=None):
+        global_options = global_options if global_options is not None else []
         if self.editable:
             self.install_editable(
                 install_options, global_options, prefix=prefix)