first commit

Python/几天前日期.py

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+import datetime
+def getdate(before):
+    # 今天
+    today = datetime.datetime.now()
+    # 偏移
+    offset = datetime.timedelta(days=before)
+
+    # 日期
+    date = (today + offset).strftime('%Y-%m-%d')
+
+    return date