# Is There Any Difference Between math.inf and float('Inf') in Python?

Other than the fact that `math.inf` and `-math.inf` were introduced in Python 3.5, there are no differences between them, and `float('inf')` and `float('-inf')`. They both follow the IEEE 754 floating-point standard and are equivalent representations of positive and negative infinity, respectively. Therefore, they can be used interchangeably. In fact, when you check the type of these values, you'll find that they are all of the same type:

```import math

print(type(math.inf)) # <class 'float'>
print(type(float('inf'))) # <class 'float'>

print(type(-math.inf)) # <class 'float'>
print(type(float('-inf'))) # <class 'float'>
```

These representations can be used interchangeably in mathematical calculations, comparisons, and other operations. For instance, consider the following, where the `math.isinf()` function can be seen to be compatible with both `math.inf` and `float('inf')` (and their negative counterparts):

```import math

print(math.isinf(math.inf)) # True
print(math.isinf(-math.inf)) # True

print(math.isinf(float('inf'))) # True
print(math.isinf(float('-inf'))) # True

print(math.isinf(42)) # False
```

Similarly, you can directly compare the values against either `math.inf` or `float('inf')` (and their negative equivalents):

```import math

print(math.inf == float('inf')) # True
print(-math.inf == -float('inf')) # True
```

In the examples above, you can see that the values are equivalent to each other. The decision to choose one over the other typically depends on personal preference or the specific coding context. However, the `math.inf` form is often preferred for semantics, readability and clarity.

This post was published by Daniyal Hamid. Daniyal currently works as the Head of Engineering in Germany and has 20+ years of experience in software engineering, design and marketing. Please show your love and support by sharing this post.