This question already has answers here:
x, = ... - is this trailing comma the comma operator? [duplicate]
(2 answers)
Meaning of using commas and underscores with Python assignment operator? [duplicate]
(4 answers)
Closed 3 years ago.
What does this code do?
f = [1]
x, = f
x is set to 1 after doing this, but I cannot figure out what the , = does.
Related
This question already has answers here:
Safely evaluate simple string equation
(4 answers)
Evaluating a mathematical expression in a string
(14 answers)
Closed 4 years ago.
I have sting input like:
12 == 21
(10 != 12) or (15 == 13)
True and (10 == 10)
And i need to return boolean value of this input. Can i convert it using exec() or bool()? I don't want to write big method to solve it .
This question already has answers here:
Reference - What does this regex mean?
(1 answer)
Regular expression: zero or more occurrences of optional character /
(1 answer)
Closed 4 years ago.
if i set the variable a to
a = "6253625879615786"
if i use the regex statement
print(re.findall(r'^[456][0-9]{15}[^,_]',a))
I do not get any output but if i use the regex statement with the * at the end to 0 or 1 times
print(re.findall(r'^[456][0-9]{15}[^,_]*',a))
Why is this?
This question already has answers here:
How to use digit separators for Python integer literals?
(4 answers)
What do 1_000 and 100_000 mean? [duplicate]
(2 answers)
Closed 4 years ago.
I find a weird thing in Python, if I assign a variable as int_int, float_int, int_float, the type will be int, float, float, seems the underline is a join character, like:
x = 100_200
then x will be a int, value is 100200. Can someone explain why and how to reasonable use?
Python 3.6 introduced Underscores in Numeric Literals.
Essentially, this is a readability feature.
Compare:
x = 100000000
and:
x = 100_000_000
This question already has answers here:
Why does map return a map object instead of a list in Python 3?
(4 answers)
Getting a map() to return a list in Python 3.x
(11 answers)
Closed 5 years ago.
How to Convert a string like '123' to int 1,2 and 3 so that I can perform 1+2+3. I am new to python. Can you please help me? I am not able to split the list. I don't think splitting the string will be of any use as there are no delimiters. Can you help me to understand how can this string elements be separated and treated as intergers?
x = "123"
s = 0
for a in x:
s = int(a) + s
This question already has answers here:
How do I pass a variable by reference?
(39 answers)
call-by-reference function parameters
(4 answers)
Immutable vs Mutable types
(18 answers)
Closed 9 years ago.
Is it possible in python to do something like this:
def number_clear(num):
num = 0
x = 10
number_clear(x)
print x
>>0
In C we could do that simply by pointers