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Spyder crashes when replacing text

See original GitHub issue

Problem Description

I have the (poorly written) python script below. I want to replace all instances of “particles” with “self.particles”. To do so, I do [Search] > [Replace text] and try to replace “particles” with “self.particles”. Spyder crashes immediately. I was having the issue with Spyder 4.1.2 inside Anaconda. I installed Spyder 4.2.0 using the stand-alone installer, but the error still exists.

What steps reproduce the problem?

Copy the EXACT following code into an editor window without saving

import rhinoscriptsyntax as rs
import random

particles = []
speedmax = 10
cycles = 20
sepval =5
alignval = 0.02 
chval = 0.02

class Particles:
    
    
    
    def __init__(self):
        
        pass

    def run(self):
        
        pass


    def flock(self):
              
        self.separate(sepval)
        self.cohesion(chval)
        self.align(alignval)

    def separate(self, magnitude):
        count = 0
        steer = [0.001,0.001,0.001]
        
        for i in range(0, len(particles)):
             dist = rs.Distance(self.coord,particles[i].coord)
             if dist>0 and dist <30 :
                 diff = rs.VectorSubtract(self.coord,particles[i].coord)
                 diff = rs.VectorUnitize(diff)
                 diff = rs.VectorScale(diff,1/dist)
                 steer = rs.VectorAdd(steer,diff)
                 count = count + 1
        if count > 0:
            steer = rs.VectorScale(steer,1/count)
        
        steer = rs.VectorScale(steer,magnitude)
        self.acc = rs.VectorAdd(self.acc,steer)


for i in range(nopoints):
    particles.append(Particles())

for i in range(cycles):
    for particle in particles:
        #particle.drawPosition()
        particle.run()

#for particle in particles:
#    rs.AddCurve(particle.path)

Click “CTRL+R” and replace “particles” with “self.particles”
Click “ALL”

Note: I tried several times to reduce the code to nail down the error. The extremely weird thing is that it’s enough to replace one method’s content with pass or deleting one of the rows at the beginning of the file containing those variables to prevent the error to occur.

However, with this EXACT content, I can reproduce the error systematically.

Versions

Spyder version: 4.2.0
Python version: 3.7.9 64-bit
Qt version: 5.12.9
PyQt version: 5.12.3
Operating System name/version: Windows 10

Dependencies


# Mandatory:
atomicwrites >=1.2.0            :  1.4.0 (OK)
chardet >=2.0.0                 :  3.0.4 (OK)
cloudpickle >=0.5.0             :  1.6.0 (OK)
diff_match_patch >=20181111     :  20200713 (OK)
intervaltree                    :  None (OK)
IPython >=4.0                   :  7.19.0 (OK)
jedi =0.17.2                    :  0.17.2 (OK)
jsonschema >=3.2.0              :  3.2.0 (OK)
nbconvert >=4.0                 :  6.0.7 (OK)
numpydoc >=0.6.0                :  1.1.0 (OK)
paramiko >=2.4.0                :  2.7.2 (OK)
parso =0.7.0                    :  0.7.0 (OK)
pexpect >=4.4.0                 :  4.8.0 (OK)
pickleshare >=0.4               :  0.7.5 (OK)
psutil >=5.3                    :  5.7.3 (OK)
pygments >=2.0                  :  2.7.2 (OK)
pylint >=1.0                    :  2.6.0 (OK)
pyls >=0.36.1;<1.0.0            :  0.36.1 (OK)
pyls_black >=0.4.6              :  0.4.6 (OK)
pyls_spyder >=0.1.1             :  0.1.1 (OK)
qdarkstyle >=2.8                :  2.8.1 (OK)
qtawesome >=0.5.7               :  1.0.1 (OK)
qtconsole >=4.7.7               :  4.7.7 (OK)
qtpy >=1.5.0                    :  1.9.0 (OK)
setuptools >=39.0.0             :  50.3.2 (OK)
sphinx >=0.6.6                  :  3.3.0 (OK)
spyder_kernels >=1.10.0;<1.11.0 :  1.10.0 (OK)
three_merge >=0.1.1             :  0.1.1 (OK)
watchdog                        :  None (OK)
zmq >=17                        :  19.0.2 (OK)

# Optional:
cython >=0.21                   :  0.29.21 (OK)
matplotlib >=2.0.0              :  3.3.2 (OK)
numpy >=1.7                     :  1.19.4 (OK)
pandas >=1.1.1                  :  1.1.4 (OK)
scipy >=0.17.0                  :  1.5.4 (OK)
sympy >=0.7.3                   :  1.6.2 (OK)