Update os/os.module.go

Co-authored-by: Sebastien Binet <[email protected]>

Author: glaukiol1

os/os.module.go

@@ -114,7 +114,7 @@ func init() {
 // getEnvVariables returns the dictionary of environment variables.
 func getEnvVariables() py.StringDict {
 	vs := os.Environ()
-	dict := py.NewStringDict()
+	dict := py.NewStringDictSized(len(vs))
 	for _, evar := range vs {
 		key_value := strings.SplitN(evar, "=", 2) // returns a []string containing [key,value]
 		dict.M__setitem__(py.String(key_value[0]), py.String(key_value[1]))