code: def assert_valid_key_label(k):
      """Assertion that passes if the input is a valid key by all the rules of
      Cloud.
  
      """
      assert_valid_label(k)
      if k != "":
          assert k[0].isalpha()
  
file_path: caliban/tests/caliban/platform/cloud/test_util.py
imports: import re
  import hypothesis.strategies
  from hypothesis import given
  import caliban.platform.cloud.util
label_desc: Use image node_id 4 for calling a global function with example usage: assert_valid_key_label(k) without return types