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python/snippets/initialize-2-d-list.md

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+---
+title: Initialize 2D list
+type: snippet
+tags: [list]
+cover: succulent-7
+dateModified: 2020-11-02T19:28:05+02:00
+---
+
+Initializes a 2D list of given width and height and value.
+
+- Use a list comprehension and `range()` to generate `h` rows where each is a list with length `h`, initialized with `val`.
+- Omit the last argument, `val`, to set the default value to `None`.
+
+```py
+def initialize_2d_list(w, h, val = None):
+  return [[val for x in range(w)] for y in range(h)]
+```
+
+```py
+initialize_2d_list(2, 2, 0) # [[0, 0], [0, 0]]
+```