new snippets

snippets/byte_size.md

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+### byte_size
+
+Returns the length of a string in bytes.
+
+`utf-8` encodes a given string and find its length.
+
+```python
+def byte_size(string):
+    return(len(string.encode('utf-8')))
+```
+
+```python
+byte_size('😀') # 4
+byte_size('Hello World') # 11
+```