题解 | 遍历字典

# 创建字典  
operators_dict = {"<": "less than", "==": "equal"}  

# 打印原始字典信息  
print("Here is the original dict:")  
for key in sorted(operators_dict):  
    print(f"Operator {key} means {operators_dict[key]}.")  

# 增加新的键值对  
operators_dict[">"] = "greater than"  

# 打印分隔行  
print()  

# 打印更改后的字典信息  
print("The dict was changed to:")  
for key in sorted(operators_dict):  
    print(f"Operator {key} means {operators_dict[key]}.")