عملگر های محاسباتی پایتون: جمع، تفریق، ضرب و تقسیم و …

number = 4

number = number + number

number = number + 3

number = number * number

number = number / number

Python 3.10.1 (tags/v3.10.1:2cd268a, Dec  6 2021, 19:10:37) [MSC v.1929 64 bit (AMD64)] on win32
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number = "4"
number + number
'44'
number * 4
'4444'
number = "17"
number * 3
'171717'
3 * number
'171717'
"17" * "3"
Traceback (most recent call last):
  File "<pyshell#6>", line 1, in <module>
    "17" * "3"
TypeError: can't multiply sequence by non-int of type 'str'
"17" + 3
Traceback (most recent call last):
  File "<pyshell#7>", line 1, in <module>
    "17" + 3
TypeError: can only concatenate str (not "int") to str
int("17")+3
20
"17"+str(3)
'173'