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What to use instead of * and / in Python to avoid ValueError? [closed]

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I'm having a similar issue as to this post:
Why does this simple numpy multiply operation raise an "invalid number of arguments" error?
I have this incredibly confusing equation in my code:
(m[0]*np.power(q[0])*q[0]*r[0]*(m[0]*R)*np.power(q[0]))/(R*((m[0]*R)*np.power(q[0])+m*np.power(q[0]))**2) - a[0]*N/(b[0]+N)
and when I run it, it returns the error:
ValueError: invalid number of arguments
I assumed it could have something to do with the ** I was using to define the exponents (q[0] is an exponent), so I substituted those to np.power() to no success. Also, I changed the / that I am using to define the fractions to *(.....)**(-1), but that didn't work either. At this point, I'm assuming the issue is with the * I'm using for multiplications. But how can I write multiplications and divisions in this long expression without raising a position error?
Thank you in advance for the help!

You have to add another argument of what power you want.
For example, power means add 2
For example, cube means add 3
np.power(x1, 2)
np.power(x1, 3)
If you just want to squre with np.power(), then I have already edited the code for you:
(m[0]*np.power(q[0], 2)*q[0]*r[0]*(m[0]*R)*np.power(q[0], 2))/(R*((m[0]*R)*np.power(q[0], 2)+m*np.power(q[0], 2))**2) - a[0]*N/(b[0]+N)

Python problem can't run module and output problem [closed]

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I write code which will output some data file, but I got error and have no idea what is wrong already looking for 2 hours (you know how is it :) )
import binascii
import sys
import time
url12 = "my win dir for file"
def toHex(s):
1st = []
for ch in s:
hv = hex(ord(ch)).replace('0x', '')
if len(hv) == 1:
1st.append(hv)
return reduce(lambda x,y:x+y, 1st)
url = toHex(url12)
.......etc.
debug output:
Traceback (most recent call last):
File "C:\Users\RED\Desktop\builder\builderUpdate.py", line 22, in <module>
url = toHex(url12)
File "C:\Users\RED\Desktop\builder\builderUpdate.py", line 20, in toHex
return reduce(lambda x,y:x+y, lst)
NameError: name 'reduce' is not defined

In Python 2, reduce was a built-in function. In Python 3, you have to import it from functools
That's why you're getting an error
Also, the empty list in your function can't begin with a number otherwise you get a syntax error. It can contain numbers but should start with an underscore or a letter

what is my mistake in the code and why is that error for? [closed]

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So basically I have to write a code which tells the user to input numbers (as variables I named them number1, number2, number3 ...) until I get the answer of zero once you add each number that they inputted then which the sum is equal to zero I should print how many numbers they inputted so the answer they got was zero, now the main thing is that I know how to write that code but there is an error that I get:
Traceback (most recent call last):
File "Solution.py", line 13, in <module>
sys.exit()
NameError: name 'sys' is not defined

Maybe try using
from sys import *
and just use exit(0) when you want to sys.exit()

Python: most recent call last error [closed]

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Can't understand the error in this as the brackets are as per directions
mean=df["Normalized-losses"].mean()
Traceback (most recent call last):
File "C:\Users\Aarushi Goyal\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pandas\core\nanops.py", line 822, in _ensure_numeric
x = float(x)
Please provide solution

Try converting the column into numeric using
pd.to_numeric(df['Normalized-losses'], errors = 'coerce')
Then try:
mean = df['Normalized-losses'].mean()
You can also use:
mean = df.loc[:, 'Normalized-losses'].mean()
If it doesn't help do provide more info regarding the error.

I think the variable "Normalized-losses" would be a non-numerical type variable.
Try pandas dtypes method to check data type:
df.dtypes
If its non-numerical then use astype() method to change the data type.

make a calculator that calculates the volume of a cube [closed]

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I am new to python and my problem is when I want to make a calculator that calculates the volume of a cube:
>>> print(int ** 3 (input ("Enter the side length: ")))
Enter the side length: 4
Traceback (most recent call last):
File "<pyshell#0>", line 1, in <module>
print(int ** 3 (input ("Enter the side length: ")))
TypeError: 'int' object is not callable

The int() function should wrap around the whole input() function, Something like this
print(int(input('Enter the side length:')) ** 3)