我的if语句或字典有问题吗？

# 错误示例
if x = 1:
    print("x is 1")

# 正确示例
if x == 1:
    print("x is 1")

# 错误示例
my_dict = {"a": 1, "b": 2}
print(my_dict["c"])  # 这将引发 KeyError

# 正确示例
print(my_dict.get("c", "default"))  # 输出 "default"

# 错误示例
my_dict = {"a": 1, "b": "2"}
if my_dict["b"] == 2:  # 这将引发 TypeError
    print("b is 2")

# 正确示例
if my_dict["b"] == "2":
    print("b is '2'")

# 错误示例
x = 10
if x > 5 and x < 5:  # 这将永远不会为真
    print("x is between 5 and 5")

# 正确示例
if x > 5 and x < 15:
    print("x is between 5 and 15")

my_dict = {"a": 1, "b": 2}
x = 1

if x == 1:
    print(my_dict["c"])
else:
    print("x is not 1")

my_dict = {"a": 1, "b": 2}
x = 1

if x == 1:
    print(my_dict.get("c", "default"))  # 输出 "default"
else:
    print("x is not 1")