Fullscreen eingestellt.

.venv/Lib/site-packages/pip/_vendor/distlib/scripts.py

@@ -49,6 +49,24 @@ if __name__ == '__main__':
     sys.exit(%(func)s())
 '''
 
+# Pre-fetch the contents of all executable wrapper stubs.
+# This is to address https://github.com/pypa/pip/issues/12666.
+# When updating pip, we rename the old pip in place before installing the
+# new version. If we try to fetch a wrapper *after* that rename, the finder
+# machinery will be confused as the package is no longer available at the
+# location where it was imported from. So we load everything into memory in
+# advance.
+
+# Issue 31: don't hardcode an absolute package name, but
+# determine it relative to the current package
+distlib_package = __name__.rsplit('.', 1)[0]
+
+WRAPPERS = {
+    r.name: r.bytes
+    for r in finder(distlib_package).iterator("")
+    if r.name.endswith(".exe")
+}
+
 
 def enquote_executable(executable):
     if ' ' in executable:
@@ -409,15 +427,11 @@ class ScriptMaker(object):
                 bits = '32'
             platform_suffix = '-arm' if get_platform() == 'win-arm64' else ''
             name = '%s%s%s.exe' % (kind, bits, platform_suffix)
-            # Issue 31: don't hardcode an absolute package name, but
-            # determine it relative to the current package
-            distlib_package = __name__.rsplit('.', 1)[0]
-            resource = finder(distlib_package).find(name)
-            if not resource:
+            if name not in WRAPPERS:
                 msg = ('Unable to find resource %s in package %s' %
                        (name, distlib_package))
                 raise ValueError(msg)
-            return resource.bytes
+            return WRAPPERS[name]
 
     # Public API follows