Error using struct.pack [closed] - python

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I am trying to create packed binary data, using struct.pack() in python3.x
It is giving me the below error, but I am unable to understand.
packed1 = struct.pack('>i4', 7, 8)
errorTraceback (most recent call last)
<ipython-input-823-a27a6bc07ff4> in <module>()
----> 1 packed1 = struct.pack('>i4', 7, 8)
error: repeat count given without format specifier


The repeat count should be before the i
struct.pack('>4i', 7, 8, 3, 2)
Also you need 4 parameters not only 2

Related

Why does this happen when I attempt to convert an Input into an integer with n=int(input("n")? (Sometimes it works) [closed]

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lukaspertl#dhcp-10-241-163-47 Cambridge year 2 % /usr/local/bin/python3 "/Users/
lukaspertl/OneDrive - University of Cambridge/Cambridge year 2/Coding/Task4/Bise
ctionMethod.py"
n:3546/usr/local/bin/python3 "/Users/lukaspertl/OneDrive - University of Cambridge/Cambridge year 2/Coding/Task4/BisectionMethod.py"
Traceback (most recent call last):
File "/Users/lukaspertl/OneDrive - University of Cambridge/Cambridge year 2/Coding/Task4/BisectionMethod.py", line 5, in <module>
n = int(input("n:"))
^^^^^^^^^^^^^^^^
ValueError: invalid literal for int() with base 10: '3546/usr/local/bin/python3 "/Users/lukaspertl/OneDrive - University of Cambridge/Cambridge year 2/Coding/Task4/BisectionMethod.py"'
I tried to convert to float first but no better results.

Python 3 str.format with decimal place [closed]

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Closed 2 years ago.
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def ShowData(data = (x)):
for r in data:
print (“{:}, {:.2f}”.format(x, x))
keep getting this error:
File "<ipython-input-10-9963f96f39ca>", line 8
print (“{:}, {:.2f}”.format(x, x))
^
SyntaxError: invalid character in identifier

Replace the “ charachter with this " ?
# data is a list of lists
def ShowData(data = (x)):
for r in data:
print ("{:}, {:.2f}".format(x, x))

Use Sum() function with lists [closed]

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What is the correct syntax for using Sum() function in python for lists?
Say we have a list called list_1. When I tried these two syntax I get the same result:
total_1 = Sum(list_1)
total_2 = list_1.Sum()
What is the best syntax for that?

To sum a list of integers or floats, the correct method is:
list_1 = [1, 2, 3]
total = sum(list_1)
print(total)
which results in the output:
6

What is wrong with this extremely simple numpy script? [closed]

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Closed 8 years ago.
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I run the following in Python 2.7
import numpy
a = numpy.ndarray(shape=(2,2), dtype=float, order='F')
print numpy.mean(a)
numpy.savetext('foo.txt', a)
and get this result
[me#foo bar]$ python f.py
8.79658981512e-317
Traceback (most recent call last):
File "f.py", line 4, in <module>
numpy.savetext('foo.txt', a)
AttributeError: 'module' object has no attribute 'savetext'
What's wrong?

It's numpy.savetxt, without the e.

print is an invalid syntax in python 3 [closed]

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Closed 9 years ago.
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I am new to this and am receiving an error that says print (line 5) is an invalid syntax
from random import randint
r=randint
while True:
s=int(input('How many sides would you like on your die')
print (r(1,s))

The problem is not actually on line 5, but on line 4. You have two ( brackets but only one ). In search of the final ) the Python interpreter checks the following line, and only at that point does it raise the error.

s=int(input('How many sides would you like on your die')
^
There is a closing parenthesis missing.

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