[Term Entry] Python Strings .isalnum() (Codecademy#3295)

* [Term Entry] Python Strings .isalnum()

* fix: spelling

* implement the suggestions

* review edits

* Update isalnum.md

---------

Author: siam1113

content/python/concepts/strings/terms/isalnum/isalnum.md

@@ -0,0 +1,51 @@
+---
+Title: '.isalnum()'
+Description: 'Returns True if all the characters in a given string are alphanumeric.'
+Subjects:
+  - 'Data Science'
+  - 'Computer Science'
+Tags:
+  - 'Strings'
+  - 'Methods'
+  - 'Functions'
+CatalogContent:
+  - 'learn-python-3'
+  - 'paths/analyze-data-with-python'
+---
+
+The **`.isalnum()`** string method takes in a string and returns `True` if all the characters are alphanumeric (`A-Z`, `a-z`, `0-9`). Otherwise, it returns `False` if the string contains any non-alphanumeric characters (e.g. `@ # $ % - *`).
+
+## Syntax
+
+```pseudo
+my_string.isalnum()
+```
+
+This method does not have any parameters.
+
+## Example
+
+The examples below use `.isalnum()` to check if all the characters are alphanumeric:
+
+```py
+my_string = "AlphaNumeric001"
+print(my_string.isalnum())
+```
+
+The code above will result in the following output:
+
+```shell
+True
+```
+
+## Codebyte Example
+
+The code below is runnable and uses the `.isalnum()` method:
+
+```codebyte/python
+my_string_1 = "string2023"
+print(my_string_1.isalnum())
+
+my_string_2 = "@lpha"
+print(my_string_2.isalnum())
+```