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random_state.shuffle is throwing exceptions in Python

I am trying to call the random_state.shuffle method in Python and keep getting the following error:
random_state.shuffle(class_data)
File "mtrand.pyx", line 4417, in numpy.random.mtrand.RandomState.shuffle
TypeError: len() of unsized object
I have initialized random_state as shown below:
random_state = np.random.RandomState(100)
After that I try to create SFrame:
def build_bitmap_sframe():
bitmaps_list, labels_list = [], []
for category in categories:
class_data = np.load(os.path.join(bitmap_directory, category + ".npy"))
print(class_data)
random_state.shuffle(class_data) # this line error
What am I missing?
Here is the link for docs: https://apple.github.io/turicreate/docs/userguide/drawing_classifier/data-preparation.html

Python - Creating an instance of a module, getting an error

I am creating a universal text field that can be used in many python turtle projects. I am trying to create an instance of it but I get this error:
>>> import TextField
>>> tf = TextField('None', False)
Traceback (most recent call last):
File "<pyshell#1>", line 1, in <module>
tf = TextField('None', False)
TypeError: 'module' object is not callable
>>>
What in a module causes this type of error? I completely wrote this module and I'm getting an error creating an instance of it :( ... What do I need in this module to make it 'callable'? I have tried adding a def __call__(self): but that doesn't affect the problem at all, nor create any errors.
Here is the beginning of the script where the problem is most likely happening:
# Created by SUPERMECHM500 # repl.it
# Edited by cdlane # stackoverflow.com
class TextField:
TextFieldBorderColor = '#0019fc'
TextFieldBGColor = '#000000'
TextFieldTextColor = '#ffffff'
ShiftedDigits = {
'1':'!',
'2':'#',
'3':'#',
'4':'$',
'5':'%',
'6':'^',
'7':'&',
'8':'*',
'9':'(',
'0':')'
}
def __init__(self, command, CanBeEmpty): # Ex. textField = TextField('Execute()', True)
self.CmdOnEnter = command
self.turtle = Turtle()
self.CanBeEmpty = CanBeEmpty
self.turtle.speed('fastest')
self.inp = []
self.FullOutput = ""
self.TextSeparation = 7
self.s = self.TextSeparation
self.key_shiftL = False
......

The module is not the class. If your class TextField is in a module called TextField, then it is referred to as TextField.TextField.
Or change your import to
from TextField import TextField

AttributeError: 'Point' object has no attribute 'point'

I am transforming a point from source frame to target frame using tf2. Below is the code snippet:
import tf2_ros
import tf2_geometry_msgs
transform = tf_buffer.lookup_transform(target_frame, source_frame, rospy.Time(0), rospy.Duration(1.0))
pose_transformed = tf2_geometry_msgs.do_transform_point(point_wrt_kinect, transform)
print pose_transformed
The code throws following error:
Traceback (most recent call last):
File "q1.py", line 29, in <module>
pose_transformed = tf2_geometry_msgs.do_transform_point(point_wrt_kinect, transform)
File "/opt/ros/indigo/lib/python2.7/dist-packages/tf2_geometry_msgs/tf2_geometry_msgs.py", line 59, in do_transform_point
p = transform_to_kdl(transform) * PyKDL.Vector(point.point.x, point.point.y, point.point.z)
AttributeError: 'Point' object has no attribute 'point'
The tf_geometry_msgs.py can be seen online at here. This seems silly as they are calling point.point.x.
Which point are they talking about? I believe it should be geometry_msgs/Point, which I declared in the following way:
from geometry_msgs.msg import Point
point_wrt_kinect = Point()
point_wrt_kinect.x = -0.41
point_wrt_kinect.y = -0.13
point_wrt_kinect.z = 0.77
Any workaround, please?

do_transform_point(point_wrt_kinect, transform)
point_wrt_kinect is the object of Point class. In documentation it should be PointStamped class object. its the error of documentation.
you have to create object of PointStamped class instead of Point class.

Python: TypeError: 'str' object is not callable Rating System

When I run this code:
def printPredictions(matches):
pPredictionTable = PrettyTable()
pPredictionTable.field_names = ["Player 1", "Player 2", "Difference", "Winner"]
for match in matches:
p1 = match['teamA']
p2 = match['teamB']
if match['aBeatb'] == True:
pPredictionTable.add_row([match['teamA'], match['teamB'], match['difference'], p1])
else:
pPredictionTable.add_row([match['teamA'], match['teamB'], match['difference'], p2])
print(pPredictionTable)
printPredictions(pmatches)
I get this error:
Traceback (most recent call last):
File "C:\Users\ericr_000\Desktop\PyDev\NPA-2-Rating-System\Rankings.py", line 645, in <module>
printPredictions()
TypeError: 'str' object is not callable
I have pmatches as a separate dictionary, and I don't have the coding skills to fix this issue. (Line 145 is printPredictions(pmatches)

If you're getting 'str' object is not callable when you try to call printPredictions, that means that by the time your program reaches line 645, the name printPredictions was reassigned to a string. Somewhere in your code you have something like
printPredictions = someStringValueGoesHere
You should choose a different name for that variable, or delete the line entirely.
foobar = someStringValueGoesHere

python: TypeError: 'str' object is not callable

i'm trying to load a binary file with pickle that has a record in a list, like so
import pickle
class player_energy_usage():
def __init__(self):
self.weapons = 25
elf.shields = 25
self.life_support = 25
self.engines = 25
def p_eu_init():
global p_energy
p_energy = []
player_ship_energy = player_energy_usage()
p_energy.append(player_ship_energy)
pickle.dump(p_energy,open('p_energy.dat','wb'))
p_eu_init()
pickle.load('rb'('p_energy.dat'))
print('Weapons are using {0}% of energy'.format(p_energy[0].weapons))
print('Shields are using {0}% of energy'.format(p_energy[0].shields))
print('Life Support is using {0}% of energy'.format(p_energy[0].life_support))
print('Engines is using {0}% of energy'.format(p_energy[0].engines))
However i get a type error,
Traceback (most recent call last):
File "E:/Python texted based game/Tests/file loading test.py", line 18, in <module>
pickle.load('rb'('p_energy.dat'))
TypeError: 'str' object is not callable
thanks for the help.

That is not the correct syntax. It should be instead:
p_energy = pickle.load(open('p_energy.dat', 'rb'))
What you're actually doing is:
'rb'('p_energy.dat') is trying to call the str object 'rb' with an argument of 'p_energy.dat', which is why you get the error 'str' object is not callable.