在Python中，format()函數允許你自定義輸出格式。它有多種用法，包括使用位置參數、關鍵字參數和格式說明符。以下是一些示例：
name = "Alice"
age = 30
print("My name is {} and I am {} years old.".format(name, age))
輸出：
My name is Alice and I am 30 years old.
name = "Alice"
age = 30
print("My name is {person} and I am {years} years old.".format(person=name, years=age))
輸出：
My name is Alice and I am 30 years old.
%s：字符串%d：整數%f：浮點數%.2f：保留兩位小數的浮點數%x：十六進制數num1 = 123
num2 = 3.14159
print("The hexadecimal representation of {} is {:x}.".format(num1, num2))
輸出：
The hexadecimal representation of 123 is 7b.
你還可以使用格式說明符的寬度和精度：
num1 = 12345
num2 = 3.14159
print("The number {} has {} digits and its float representation is {:.2f}.".format(num1, len(str(num1)), num2))
輸出：
The number 12345 has 5 digits and its float representation is 3.14.
