[Lang] Add time check before performing version check

python/taichi/core/util.py

@@ -110,7 +110,6 @@ def get_unique_task_id():
 ti_core = import_ti_core()
 
 ti_core.set_python_package_dir(package_root())
-os.makedirs(ti_core.get_repo_dir(), exist_ok=True)
 
 log_level = os.environ.get('TI_LOG_LEVEL', '')
 if log_level:

python/taichi/main.py

@@ -1,4 +1,5 @@
 import argparse
+import datetime
 import math
 import os
 import platform
@@ -69,7 +70,25 @@ def __init__(self, test_mode: bool = False):
 
         self.main_parser = parser
 
-        self._check_version()
+        # Check timestamp
+        os.makedirs(_ti_core.get_repo_dir(), exist_ok=True)
+        timestamp_path = os.path.join(_ti_core.get_repo_dir(), 'timestamp')
+        cur_date = datetime.date.today()
+        if os.path.exists(timestamp_path):
+            last_time = ''
+            with open(timestamp_path, 'r') as f:
+                last_time = f.readlines()[0].rstrip()
+            if cur_date.strftime('%Y-%m-%d') > last_time:
+                with open(timestamp_path, 'w') as f:
+                    f.write((cur_date +
+                             datetime.timedelta(days=14)).strftime('%Y-%m-%d'))
+                    f.truncate()
+                self._check_version()
+        else:
+            with open(timestamp_path, 'w') as f:
+                f.write((cur_date +
+                         datetime.timedelta(days=14)).strftime('%Y-%m-%d'))
+            self._check_version()
 
     @timer
     def __call__(self):