python int float str
时间: 2023-12-31 20:04:50 浏览: 24
As an AI language model, I can provide a brief explanation of int, float, and str in Python.
- int: An int is a data type in Python that represents whole numbers. It can be positive or negative, but it cannot have a decimal point. For example, 1, 2, 3, -4, and 0 are all integers.
- float: A float is a data type in Python that represents numbers with decimal points. For example, 1.2, 3.14159, and -0.5 are all floats.
- str: A str is a data type in Python that represents a string of characters, such as letters, numbers, or symbols. Strings are typically enclosed in quotes, either single or double. For example, "hello", 'world', "123", and "!!!" are all strings.
相关问题
Python int(a)
Python中的int()函数用于将一个字符串或数字转换为整数类型。它的语法是int(x, base),其中x是要转换的字符串或数字,base是进制数,默认为10进制。
如果x是一个字符串,int()函数会尝试将其解析为一个整数。如果字符串中包含非数字字符,则会引发ValueError异常。例如:
```python
num_str = "123"
num = int(num_str)
print(num) # 输出:123
```
如果x是一个浮点数,int()函数会将其截断为整数部分。例如:
```python
float_num = 3.14
num = int(float_num)
print(num) # 输出:3
```
如果x是一个其他类型的对象,int()函数会尝试调用该对象的`__int__()`方法来获取整数值。如果对象没有实现`__int__()`方法,则会引发TypeError异常。
python怎么把str转换成int
可以使用内置函数int()进行转换,如:
```
string = "123"
number = int(string)
print(number) # 123
```
也可以使用内置函数float()转换为浮点型,如:
```
string = "123.456"
number = float(string)
print(number) # 123.456
```