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TypeError: can only concatenate str (not "float") to str

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以下の実行時にエラー

test.py
NUM=100.00
print("TEST:" + NUM)
$ python test.py
TypeError: can only concatenate str (not "float") to str

strを加えて解決

test.py
NUM=100.00
print("TEST:" + str(NUM))
$ python test.py
TEST:100.00
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