You can’t subtract a list from a list. >>> [3, 7] – [1, 2] Traceback (most recent call last): File “<stdin>”, line 1, in <module> TypeError: unsupported operand type(s) for -: ‘list’ and ‘list’ Simple way to do it is using numpy: >>> import numpy as np >>> np.array([3, 7]) – np.array([1, 2]) array([2, 5]) …
Using the colon in an indexing operation generates a slice object, which is not hashable.
The following answer only applies to Python < 3.9 The expression list[int] is attempting to subscript the object list, which is a class. Class objects are of the type of their metaclass, which is type in this case. Since type does not define a __getitem__ method, you can’t do list[…]. To do this correctly, you …
To use the class, first create an instance, like so: p = Pump() p.getPumps() A full example: >>> class TestClass: … def __init__(self): … print(“init”) … def testFunc(self): … print(“Test Func”) … >>> testInstance = TestClass() init >>> testInstance.testFunc() Test Func
You should encode str into bytes. data_string = os.environ[‘INTRINIO_USER’] + “:” + os.environ[‘INTRINIO_PASSWORD’] data_bytes = data_string.encode(“utf-8”) base64.b64encode(data_bytes)
The file is already closed (when the previous with block finishes), so you cannot do anything more to the file. To reopen the file, create another with statement and use the read attribute to read the file. with open(‘test_output.txt’, ‘r’) as f2: data = f2.read() print(data)
urlopen() returns a bytes object, to perform string operations over it you should convert it to str first. for word in urlopen(WORD_URL).readlines(): WORDS.append(word.strip().decode(‘utf-8’)) # utf-8 works in your case To get the correct charset : How to download any(!) webpage with correct charset in python?
Python’s exponentiation operator is **, not ^. ^ is bitwise XOR. f=math.sqrt(1+(6*x+4)**2)
‘ ‘ is a string which you’re calling its join method with a byte sequence. As the documentation’s stated, in python-3.x: str.joinReturn a string which is the concatenation of the strings in the iterable iterable. A TypeError will be raised if there are any non-string values in iterable, including bytes objects. The separator between elements …