MAINT: Change all SO links to use HTTPS

pandas/core/dtypes/missing.py

@@ -212,7 +212,7 @@ def _use_inf_as_na(key):
     This approach to setting global module values is discussed and
     approved here:
 
-    * http://stackoverflow.com/questions/4859217/
+    * https://stackoverflow.com/questions/4859217/
       programmatically-creating-variables-in-python/4859312#4859312
     """
     flag = get_option(key)

pandas/io/sql.py

@@ -1393,7 +1393,7 @@ def _get_unicode_name(name):
 
 
 def _get_valid_sqlite_name(name):
-    # See http://stackoverflow.com/questions/6514274/how-do-you-escape-strings\
+    # See https://stackoverflow.com/questions/6514274/how-do-you-escape-strings\
     # -for-sqlite-table-column-names-in-python
     # Ensure the string can be encoded as UTF-8.
     # Ensure the string does not include any NUL characters.

pandas/tests/groupby/aggregate/test_other.py

@@ -26,7 +26,7 @@
 
 def test_agg_api():
     # GH 6337
-    # http://stackoverflow.com/questions/21706030/pandas-groupby-agg-function-column-dtype-error
+    # https://stackoverflow.com/questions/21706030/pandas-groupby-agg-function-column-dtype-error
     # different api for agg when passed custom function with mixed frame
 
     df = DataFrame(

pandas/tests/groupby/test_categorical.py

@@ -798,7 +798,7 @@ def test_groupby_empty_with_category():
 
 def test_sort():
 
-    # http://stackoverflow.com/questions/23814368/sorting-pandas-
+    # https://stackoverflow.com/questions/23814368/sorting-pandas-
     #        categorical-labels-after-groupby
     # This should result in a properly sorted Series so that the plot
     # has a sorted x axis

pandas/tests/indexing/multiindex/test_chaining_and_caching.py

@@ -8,7 +8,7 @@
 
 def test_detect_chained_assignment():
     # Inplace ops, originally from:
-    # http://stackoverflow.com/questions/20508968/series-fillna-in-a-multiindex-dataframe-does-not-fill-is-this-a-bug
+    # https://stackoverflow.com/questions/20508968/series-fillna-in-a-multiindex-dataframe-does-not-fill-is-this-a-bug
     a = [12, 23]
     b = [123, None]
     c = [1234, 2345]

pandas/tests/indexing/multiindex/test_setitem.py

@@ -141,7 +141,7 @@ def test_multiindex_setitem(self):
             df.loc["bar"] *= 2
 
         # from SO
-        # http://stackoverflow.com/questions/24572040/pandas-access-the-level-of-multiindex-for-inplace-operation
+        # https://stackoverflow.com/questions/24572040/pandas-access-the-level-of-multiindex-for-inplace-operation
         df_orig = DataFrame.from_dict(
             {
                 "price": {

pandas/tests/indexing/test_chaining_and_caching.py

@@ -273,7 +273,7 @@ def random_text(nobs=100):
         str(df)
 
         # from SO:
-        # http://stackoverflow.com/questions/24054495/potential-bug-setting-value-for-undefined-column-using-iloc
+        # https://stackoverflow.com/questions/24054495/potential-bug-setting-value-for-undefined-column-using-iloc
         df = DataFrame(np.arange(0, 9), columns=["count"])
         df["group"] = "b"
 

pandas/tests/io/parser/test_common.py

@@ -1131,7 +1131,7 @@ def test_trailing_delimiters(all_parsers):
 
 
 def test_escapechar(all_parsers):
-    # http://stackoverflow.com/questions/13824840/feature-request-for-
+    # https://stackoverflow.com/questions/13824840/feature-request-for-
     # pandas-read-csv
     data = '''SEARCH_TERM,ACTUAL_URL
 "bra tv bord","http://www.ikea.com/se/sv/catalog/categories/departments/living_room/10475/?se%7cps%7cnonbranded%7cvardagsrum%7cgoogle%7ctv_bord"