update

2022.03.16_frequently_used_python_package/pickle_example.py

@@ -3,9 +3,9 @@ import pickle
 data = [1, 2, 3]
 
 # 保存为文件
-with open('a.txt', 'wb') as f:
+with open('a.pkl', 'wb') as f:
     pickle.dump(data, f)
-with open('a.txt', 'rb') as f:
+with open('a.pkl', 'rb') as f:
     data_load_from_file = pickle.load(f)
 print(data_load_from_file)
 print()

2025.03.01_False_test/False_test.py

@@ -0,0 +1,59 @@
+"""
+This code is supported by the website: https://www.guanjihuan.com
+The newest version of this code is on the web page: https://www.guanjihuan.com/archives/45201
+"""
+
+# False 布尔值
+print(bool(False))  
+print(bool(0))
+print(bool(0.0))
+print(bool(0.0j))
+print(bool(None))
+print(bool('')) 
+print(bool([]))
+print(bool({}))
+print(bool(())) 
+print(bool(set()))
+print()
+
+# 虽然布尔值相同，但只有 False, 0, 0.0, 0.0j 和 False 等价
+print(False==False) # True
+print(False==0) # True
+print(False==0.0) # True
+print(False==0.0j) # True
+print(False==None) # False
+print(False=='') # False
+print(False==[]) # False
+print(False=={}) # False
+print(False==()) # False
+print(False==set()) # False
+print()
+
+def true_or_false(a):
+    if a:
+        print('True')
+    else:
+        print('False')
+
+# 'if' 环境中的 False 测试
+true_or_false(False)
+true_or_false(0)
+true_or_false(0.0)
+true_or_false(0.0j)
+true_or_false(None)
+true_or_false('')
+true_or_false([])
+true_or_false({})
+true_or_false(())
+true_or_false(set())
+print()
+
+# 'if' 环境中的 True 测试
+true_or_false(True)
+true_or_false('True')
+true_or_false('False')
+true_or_false('a')
+true_or_false(1)
+true_or_false(-1)
+true_or_false(2)
+print()