字面量

以變數或常量給出的原始資料

字面量型別：

數值型

字元型

布林型

字面量集合：列表，元組，字典，集合

特殊字面量：None

字面量插值

將變數，常量以及表示式插入的一種技術，他可以避免字串拼接的問題

3種方法

1 格式化

%的用法

>>> name = "lili"
>>> print("my name is %s" %name)
my name is lili

>>> name = "lili"
>>> print("my name is %s" %name)
my name is lili
>>> age = 10
>>> print("my name is %s,my age is %d" %(name,age))
my name is lili,my age is 10
>>>

>>> name = "lili"
>>> print("my name is %s" %name)
my name is lili
>>> age = 10
>>> print("my name is %s,my age is %d" %(name,age))
my name is lili,my age is 10
>>> print("my name is %s,my age is %d,num is %f" %(name,age,3.34444))
my name is lili,my age is 10,num is 3.344440
>>>

>>> print("my name is %s,my age is %d,num is %.2f" %(name,age,3.34444))
my name is lili,my age is 10,num is 3.34
>>>

2 format（）方法

用法：str.format()可以將

字串

列表

欄位

name = "lili"
print("my name is {}".format(name))

name = "lili"
age = 90
print("my name is {},age is {}".format(name,age))

name = "lili"
age = 90
print("my name is {0},age is {1}".format(name,age))
print("my name is {1},age is {0}".format(name,age))

　輸出結果

D:\py\test\venv\Scripts\python.exe "D:/py/test/拉勾-第三階段/模組7 輸入與輸出.py"
my name is lili,age is 90
my name is 90,age is lili