Problem p02679 (python)

Fixed submission:
from math import gcd
n = int(input())
p = 10**9 + 7
iwashi = {}
bad = 0
ans = 1
for i in range(n):
    x, y = map(int, input().split())
    if(x == 0 and y == 0):
      bad += 1
      continue
    elif(x == 0):
        try:
        	iwashi[(0, 1)] += 1
        except KeyError:
            iwashi[(0, 1)] = 1
            continue
    elif(y == 0):
        try:
        	iwashi[(1, 0)] += 1
        except KeyError:
            iwashi[(1, 0)] = 1
        continue
    else:
        g = gcd(x, y)
        x, y = x // g, y // g
        if x < 0:
            x, y = -x, -y
        try:
        	iwashi[(x, y)] += 1
        except KeyError:
            iwashi[(x, y)] = 1
            
for x, y in iwashi:
    a = iwashi[(x, y)]
    if y > 0:
    	rx,ry = y, -x
    else:
      	rx,ry = -y, x
    try:
        b = iwashi[(rx,ry)]
        iwashi[(rx,ry)] = 0
    except KeyError:
      	b = 0
    ans *= pow(2, a, p) + pow(2, b, p) - 1
    ans %= p
    iwashi[(x, y)] = 0
print((ans + bad - 1) % p)

Buggy submission (verdict: Runtime Error):
from math import gcd
n = int(input())
p = 10**9 + 7
iwashi = {}
bad = 0
ans = 1
for i in range(n):
    x, y = map(int, input().split())
    if(x == 0 and y == 0):
      bad += 1
      continue
    elif(x == 0):
		try:
        	iwashi[(0, -1)] += 1
		except KeyError:
            iwashi[(0, -1)] = 1
        continue
    elif(y == 0):
        try:
        	iwashi[(-1, 0)] += 1
		except KeyError:
            iwashi[(-1, 0)] = 1
        continue
    else:
        g = gcd(x, y)
        x, y = x // g, y // g
        if x < 0:
            x, y = -x, -y
        try:
        	iwashi[(x, y)] += 1
        except KeyError:
            iwashi[(x, y)] = 1
            
for x, y in iwashi:
    a = iwashi[(x, y)]
    if y > 0:
    	rx,ry = y, -x
    else:
      	rx,ry = y, -x
    try:
        b = iwashi[(rx,ry)]
        iwashi[(rx,ry)] = 0
    except KeyError:
      	b = 0
    ans *= pow(2, a, p) + pow(2, b, p) - 1
    ans %= p
    iwashi[(x, y)] = 0
print((ans + bad - 1) % p)

Buggy submission (verdict: Runtime Error):
from math import gcd
n = int(input())
p = 10**9 + 7
iwashi = {}
bad = 0
ans = 1
for i in range(n):
    x, y = map(int, input().split())
    if(x == 0 and y == 0):
      bad += 1
      continue
    elif(x == 0):
        iwashi[(0, -1)] += 1
        continue
    elif(y == 0):
        iwashi[(1, 0)] += 1
        continue
    else:
        g = gcd(x, y)
        x, y = x // g, y // g
        if x < 0:
            x, y = -x, -y
        try:
        	iwashi[(x, y)] += 1
        except KeyError:
            iwashi[(x, y)] = 1
            
for x, y in iwashi:
    a = iwashi[(x, y)]
    if y > 0:
    	rx,ry = y, -x
    else:
      	rx,ry = -y, x
    try:
        b = iwashi[(rx,ry)]
        iwashi[(rx,ry)] = 0
    except KeyError:
      	b = 0
    ans *= pow(2, a, p) + pow(2, b, p) - 1
    ans %= p
    iwashi[(x, y)] = 0
print((ans + bad - 1) % p)

Buggy submission (verdict: Runtime Error):
from math import gcd
n = int(input())
p = 10**9 + 7
iwashi = {}
bad = 0
ans = 1
for i in range(n):
    x, y = map(int, input().split())
    if(x == 0 and y == 0):
      bad += 1
      continue
    elif(x == 0):
        iwashi[(0, -1)] += 1
        continue
    elif(y == 0):
        iwashi[(1, 0)] += 1
        continue
    else:
        g = gcd(x, y)
        x, y = x // g, y // g
        if x < 0:
            x, y = -x, -y
        try:
        	iwashi[(x, y)] += 1
        except KeyError:
            iwashi[(x, y)] = 1
            
for x, y in iwashi:
    a = iwashi[(x, y)]
    if y > 0:
    	rx,ry = y, -x
    else:
      	rx,ry = y, -x
    try:
        b = iwashi[(rx,ry)]
        iwashi[(rx,ry)] = 0
    except KeyError:
      	b = 0
    ans *= pow(2, a, p) + pow(2, b, p) - 1
    ans %= p
    iwashi[(x, y)] = 0
print((ans + bad - 1) % p)