python3
pycharm
一、字符串
用单引号、双引号、三引号引用起来
a='test,abc' b="quit,wer" c='''i love_you,name!''' print(a,b,c) print(type(a),type(b),type(c))
-------------------------------
test,abc quit,wer i love_you,name!
<class 'str'> <class 'str'> <class 'str'>
二、数字
1、整数 int
2、浮点数 float
a=12
b=85.3645
c=round(35.22254,1)
print(a,b,c)
print(type(a),type(b),type(c))
-------------------------------
12 85.3645 35.2
<class 'int'> <class 'float'> <class 'float'>
三、布尔值
a=False
b=True
print(a,b)
print(type(a),type(b))
-------------------------------
False True
<class 'bool'> <class 'bool'>
四、类型转换
a='1554'
b=98
c=2.33
print(a,b,c)
print(type(a),type(b),type(c))
a=int(a)
b=float(b)
c=str(c)
print(a,b,c)
print(type(a),type(b),type(c))
-------------------------------
1554 98 2.33
<class 'str'> <class 'int'> <class 'float'>
1554 98.0 2.33
<class 'int'> <class 'float'> <class 'str'>
五、空值
a=None print(a) print(type(a))
-------------------------------
None
<class 'NoneType'>