The Python **issubset()** function allows you to check if a set is a subset of another set.

```
a = {1, 2, 3}
b = {1, 2, 3, 4, 5, 6}
print(a.issubset(b))
#Output:
True
```

When working with different collections of data, the ability to easily determine properties of these objects can be useful.

One such property is if a set is a subset of another set.

A set X is a subset of another set Y if all of the elements of the set X are in the set Y.

In Python, you can use the **issubset()** function to check if a set is a subset of another set. **issubset()** returns a boolean value.

Below is a simple example showing you how to check if a set is a subset of another set using the **issubset()** function in Python.

```
a = {1, 2, 3}
b = {1, 2, 3, 4, 5, 6}
print(a.issubset(b))
#Output:
True
```

## Using < and ≤ Operators to Check if Set is Subset in Python

In addition to the **issubset()** function, you can also use the < and ≤ operators to check if a set is a subset of another set.

The < operator checks if the subset is a proper subset, and ≤ checks if the set is contained in the other set with chance for equality.

Below are some examples showing how to use the < and ≤ operators to check if a set is a subset of another set in Python.

```
a = {1, 2, 3}
b = {1, 2, 3, 4, 5, 6}
print(a < a)
print(a < b)
print(a <= a)
print(a <= b)
#Output:
False
True
True
True
```

## Using Python issuperset() Function to Check if Set is Superset of Another Set

If you want to go the other way and check if a set is a superset of another set, or that all of the elements of the set are also in the other set, then you can use the issuperset() function.

Just like **issubset()**, **issuperset()** returns a boolean value.

Below is a simple example showing you how to check if a set is a subset of another set using the **issubset()** function in Python.

```
a = {1, 2, 3}
b = {1, 2, 3, 4, 5, 6}
print(b.issuperset(a))
#Output:
True
```

Hopefully this article has been useful for you to learn how to use the **issubset()** function in Python.

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