[cherry-pick] Fix CI Python3 on release/2.1 (#32930)

 Fix CI Python3 on release/2.1 #32930 

python/unittest_py/requirements.txt

@@ -10,3 +10,4 @@ scipy>=0.19.0, <=1.2.1 ; python_version<"3.5"
 scipy<=1.3.1 ; python_version=="3.5"
 scipy ; python_version>"3.5"
 prettytable
+distro

tools/check_op_desc.py

@@ -17,8 +17,6 @@ import sys
 from paddle.utils import OpLastCheckpointChecker
 from paddle.fluid.core import OpUpdateType
 
-SAME = 0
-
 INPUTS = "Inputs"
 OUTPUTS = "Outputs"
 ATTRS = "Attrs"
@@ -71,7 +69,7 @@ def diff_vars(origin_vars, new_vars):
     vars_name_only_in_new = set(new_vars.keys()) - set(origin_vars.keys())
 
     for var_name in common_vars_name:
-        if cmp(origin_vars.get(var_name), new_vars.get(var_name)) == SAME:
+        if origin_vars.get(var_name) == new_vars.get(var_name):
             continue
         else:
             error, var_error = True, True
@@ -120,7 +118,7 @@ def diff_attr(ori_attrs, new_attrs):
     attrs_only_in_new = set(new_attrs.keys()) - set(ori_attrs.keys())
 
     for attr_name in common_attrs:
-        if cmp(ori_attrs.get(attr_name), new_attrs.get(attr_name)) == SAME:
+        if ori_attrs.get(attr_name) == new_attrs.get(attr_name):
             continue
         else:
             error, attr_error = True, True
@@ -184,7 +182,7 @@ def compare_op_desc(origin_op_desc, new_op_desc):
     new = json.loads(new_op_desc)
     desc_error_message = {}
     version_error_message = {}
-    if cmp(origin_op_desc, new_op_desc) == SAME:
+    if origin_op_desc == new_op_desc:
         return desc_error_message, version_error_message
 
     for op_type in origin:

tools/summary_env.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 import os
 import sys
+import distro
 import platform
 import subprocess
 
@@ -47,8 +48,8 @@ def get_os_info():
         plat = "macOs"
         ver = platform.mac_ver()[0]
     elif platform.system() == "Linux":
-        plat = platform.linux_distribution()[0]
-        ver = platform.linux_distribution()[1]
+        plat = distro.linux_distribution()[0]
+        ver = distro.linux_distribution()[1]
     elif platform.system() == "Windows":
         plat = "Windows"
         ver = platform.win32_ver()[0]