If I print pts[0][0] before the set of if statements, the statement print("final pts: ", pts) always prints an empty array. However, if I print pts[0][0] after the set of if statements, the line print("final pts: ", pts) displays the correct values.
I believe it has something to do with the pts.pop(0) line because that doesn't properly work either. It doesn't work properly when i = 2.
Can anyone reproduce this result? Why does the print statement affect list values?
from matplotlib.lines import Line2D
import matplotlib.pyplot as plt
import numpy as np
x = [10, 24, 23, 23, 3]
y = [12, 2, 3, 4, 2]
skpoints = list(zip(x, y))
for i in skpoints:
print(i)
limits = np.arange(-1, 2)
pts = []
cutoff = 10
master = []
for i in range(len(skpoints)):
pts = []
temp = 1000
print("\ni: ", i)
for j in limits:
try:
dist = np.sqrt((skpoints[i][0] - skpoints[i + j][0]) ** 2 + (skpoints[i][1] - skpoints[i + j][1]) ** 2)
print(dist)
if 0 < dist < temp and (skpoints[i] and skpoints[i+j]) not in pts and dist < cutoff:
print('pts before if statements', pts[0])
# if its empty, add point right away
if not master or not pts:
pts.append([dist, skpoints[i], skpoints[i + j]])
# if dist is smaller than previous distance, replace distance and points
elif dist < pts[0][0]:
pts.pop(0)
pts.append([dist, skpoints[i], skpoints[i + j]])
elif dist == temp and (skpoints[i] and skpoints[i+j]) not in pts:
pts.append([skpoints[i], skpoints[i + j]])
temp = dist
print('pts after if statements', pts[0])
except IndexError:
j -= 1
print("final pts: ", pts)
The problem is your blank try..catch; you're silently swallowing any and all exceptions without even printing any trace of them, which makes debugging a whole lot harder.
The print('pts before if statements', pts[0]) statement is raising an IndexError exception if pts is empty, which bypasses the entire rest of the loop body and hence leads to an entirely different result.