[pylint]: bad-string-format-type (#2572)

docs/rules/bad-string-format-type.md

@@ -0,0 +1,20 @@
+# bad-string-format-type (PLE1307)
+
+Derived from the **Pylint** linter.
+
+### What it does
+Checks for mismatched argument types in "old-style" format strings.
+
+### Why is this bad?
+The format string is not checked at compile time, so it is easy to
+introduce bugs by mistyping the format string.
+
+### Example
+```python
+print("%d" % "1")
+```
+
+Use instead:
+```python
+print("%d" % 1)
+```