Python-从列表中调用元素会返回错误的元素

Question

from this list, from which I shuffle:

RotationSpeedArray = [4,6,8,10] #in Hz
random.shuffle(RotationSpeedArray)

I try to call it from one specific number at a time,

print RotationSpeedArray[0]
print RotationSpeedArray[1]
print RotationSpeedArray[2]
print RotationSpeedArray[3]

but whenever I do I get this:

#an actual empty space
[
6
,

The code from this is part is meant to draw a figure and rotate it. We want to do so a different speeds, so that's why we created a list from which it takes one of those rotation speeds and uses it. The figure actually moves for each trial at a different speed, so the process of taking one value at a time works. I just don't get why whenever I ask to show me each value of the list, it does this.

I hope this is sufficiently clear; please don't hesitate asking me any question.

Answer 1

I'm having no problems. Are you sure you're not surrounding converting your list to a string somewhere down the line?? It's treating RotationSpeedArray as a string, which is why I ask.

random.shuffle will throw a TypeError if you had put quotes around the list, so I'm assuming there is code you're not showing us somewhere past that which is converting it to a string?

import random
RotationSpeedArray = [4,6,8,10] #in Hz
random.shuffle(RotationSpeedArray)

# the problem is happening here


print(RotationSpeedArray[0])
print(RotationSpeedArray[1])
print(RotationSpeedArray[2])
print(RotationSpeedArray[3])

print(RotationSpeedArray)

# To demonstrate your particular issue, if we convert the list to a string
# we get the same problem you're having
StringArray = str(RotationSpeedArray)

print(StringArray[0])
print(StringArray[1])
print(StringArray[2])
print(StringArray[3])

print(StringArray)

Output:

10
6
4
8
[10, 6, 4, 8]
[
1
0
,
[10, 6, 4, 8]