使用.format()设置字符串化字典的字符串格式

person = {'name': 'Alice', 'age': 30, 'city': 'New York'}

# 使用关键字参数进行格式化
formatted_string = "Name: {name}, Age: {age}, City: {city}".format(**person)
print(formatted_string)  # 输出: Name: Alice, Age: 30, City: New York

# 使用位置参数进行格式化
formatted_string = "Name: {}, Age: {}, City: {}".format(person['name'], person['age'], person['city'])
print(formatted_string)  # 输出: Name: Alice, Age: 30, City: New York

# 混合使用位置参数和关键字参数
formatted_string = "Name: {name}, Age: {1}, City: {city}".format(person['name'], person['age'], **person)
print(formatted_string)  # 输出: Name: Alice, Age: 30, City: New York

# 使用dict.get()避免KeyError
formatted_string = "Name: {name}, Age: {age}, City: {city}".format(**{k: person.get(k, 'Unknown') for k in ['name', 'age', 'city']})
print(formatted_string)  # 如果某个键不存在，将输出'Unknown'

# 使用条件语句进行检查
if all(key in person for key in ['name', 'age', 'city']):
    formatted_string = "Name: {name}, Age: {age}, City: {city}".format(**person)
else:
    formatted_string = "Incomplete information"
print(formatted_string)