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      1 """Verify that warnings are issued for global statements following use."""
      2 
      3 from test.test_support import run_unittest, check_syntax_error
      4 import unittest
      5 import warnings
      6 
      7 
      8 class GlobalTests(unittest.TestCase):
      9 
     10     def test1(self):
     11         prog_text_1 = """\
     12 def wrong1():
     13     a = 1
     14     b = 2
     15     global a
     16     global b
     17 """
     18         check_syntax_error(self, prog_text_1)
     19 
     20     def test2(self):
     21         prog_text_2 = """\
     22 def wrong2():
     23     print x
     24     global x
     25 """
     26         check_syntax_error(self, prog_text_2)
     27 
     28     def test3(self):
     29         prog_text_3 = """\
     30 def wrong3():
     31     print x
     32     x = 2
     33     global x
     34 """
     35         check_syntax_error(self, prog_text_3)
     36 
     37     def test4(self):
     38         prog_text_4 = """\
     39 global x
     40 x = 2
     41 """
     42         # this should work
     43         compile(prog_text_4, "<test string>", "exec")
     44 
     45 
     46 def test_main():
     47     with warnings.catch_warnings():
     48         warnings.filterwarnings("error", module="<test string>")
     49         run_unittest(GlobalTests)
     50 
     51 if __name__ == "__main__":
     52     test_main()
     53