Buggy python submission (verdict: Runtime Error):
# AtCoder Beginner Contest 126
# https://atcoder.jp/contests/abc126
import sys
#import numpy as np

s2nn = lambda s: [int(c) for c in s.split(' ')]
ss2nn = lambda ss: [int(s) for s in ss]
ss2nnn = lambda ss: [s2nn(s) for s in ss]
i2s = lambda: sys.stdin.readline().rstrip()
i2n = lambda: int(i2s())
i2nn = lambda: s2nn(i2s())
ii2ss = lambda n: [sys.stdin.readline().rstrip() for _ in range(n)]
ii2nn = lambda n: ss2nn(ii2ss(n))
ii2nnn = lambda n: ss2nnn(ii2ss(n))

def main():
    N = i2n()
    d = [[] for _ in range(N)]
    #uvw = ii2nnn(N-1)
    #for u, v, w in uvw:
    for _ in range(N-1):
        u, v, w = i2nn()
        b = w % 2 == 0
        d[u-1].append((v-1, b))
        d[v-1].append((u-1, b))
    nn = [-1 for _ in range(N)]
    nn[0] = 0
    def main2(src):
        links = d[src]
        c = nn[src]
        for dst, b in links:
            if nn[dst] == -1:
                nn[dst] = c if b else 1-c
                main2(dst)
    main2(0)
    for n in nn:
        print(n)

main()


Fixed submission:
# AtCoder Beginner Contest 126
# https://atcoder.jp/contests/abc126
import sys
#import numpy as np

s2nn = lambda s: [int(c) for c in s.split(' ')]
ss2nn = lambda ss: [int(s) for s in ss]
ss2nnn = lambda ss: [s2nn(s) for s in ss]
i2s = lambda: sys.stdin.readline().rstrip()
i2n = lambda: int(i2s())
i2nn = lambda: s2nn(i2s())
ii2ss = lambda n: [sys.stdin.readline().rstrip() for _ in range(n)]
ii2nn = lambda n: ss2nn(ii2ss(n))
ii2nnn = lambda n: ss2nnn(ii2ss(n))

def main():
    N = i2n()
    d = [[] for _ in range(N)]
    #uvw = ii2nnn(N-1)
    #for u, v, w in uvw:
    for _ in range(N-1):
        u, v, w = i2nn()
        b = w % 2 == 0
        d[u-1].append((v-1, b))
        d[v-1].append((u-1, b))
    nn = [-1 for _ in range(N)]
    nn[0] = 0
    def main2(src):
        links = d[src]
        c = nn[src]
        for dst, b in links:
            if nn[dst] == -1:
                nn[dst] = c if b else 1-c
                main2(dst)
    #main2(0)
    que = [0]
    que2 = []
    while True:
        if len(que) == 0:
            break
        que2 = []
        for src in que:
            links = d[src]
            c = nn[src]
            for dst, b in links:
                if nn[dst] == -1:
                    nn[dst] = c if b else 1-c
                    que2.append(dst)
        que = que2
    for n in nn:
        print(n)

main()

Buggy python submission (verdict: Runtime Error):
# AtCoder Beginner Contest 126
# https://atcoder.jp/contests/abc126
import sys
#import numpy as np

s2nn = lambda s: [int(c) for c in s.split(' ')]
ss2nn = lambda ss: [int(s) for s in ss]
ss2nnn = lambda ss: [s2nn(s) for s in ss]
i2s = lambda: sys.stdin.readline().rstrip()
i2n = lambda: int(i2s())
i2nn = lambda: s2nn(i2s())
ii2ss = lambda n: [sys.stdin.readline().rstrip() for _ in range(n)]
ii2nn = lambda n: ss2nn(ii2ss(n))
ii2nnn = lambda n: ss2nnn(ii2ss(n))

def main():
    N = i2n()
    uvw = ii2nnn(N-1)
    d = [[] for _ in range(N)]
    for u, v, w in uvw:
        b = w % 2 == 0
        d[u-1].append((v-1, b))
        d[v-1].append((u-1, b))
    nn = [-1 for _ in range(N)]
    nn[0] = 0
    def main2(src):
        links = d[src]
        c = nn[src]
        for dst, b in links:
            if nn[dst] == -1:
                nn[dst] = c if b else 1-c
                main2(dst)
    main2(0)
    for n in nn:
        print(n)

main()


Fixed submission:
# AtCoder Beginner Contest 126
# https://atcoder.jp/contests/abc126
import sys
#import numpy as np

s2nn = lambda s: [int(c) for c in s.split(' ')]
ss2nn = lambda ss: [int(s) for s in ss]
ss2nnn = lambda ss: [s2nn(s) for s in ss]
i2s = lambda: sys.stdin.readline().rstrip()
i2n = lambda: int(i2s())
i2nn = lambda: s2nn(i2s())
ii2ss = lambda n: [sys.stdin.readline().rstrip() for _ in range(n)]
ii2nn = lambda n: ss2nn(ii2ss(n))
ii2nnn = lambda n: ss2nnn(ii2ss(n))

def main():
    N = i2n()
    d = [[] for _ in range(N)]
    #uvw = ii2nnn(N-1)
    #for u, v, w in uvw:
    for _ in range(N-1):
        u, v, w = i2nn()
        b = w % 2 == 0
        d[u-1].append((v-1, b))
        d[v-1].append((u-1, b))
    nn = [-1 for _ in range(N)]
    nn[0] = 0
    def main2(src):
        links = d[src]
        c = nn[src]
        for dst, b in links:
            if nn[dst] == -1:
                nn[dst] = c if b else 1-c
                main2(dst)
    #main2(0)
    que = [0]
    que2 = []
    while True:
        if len(que) == 0:
            break
        que2 = []
        for src in que:
            links = d[src]
            c = nn[src]
            for dst, b in links:
                if nn[dst] == -1:
                    nn[dst] = c if b else 1-c
                    que2.append(dst)
        que = que2
    for n in nn:
        print(n)

main()

Buggy python submission (verdict: Runtime Error):
# AtCoder Beginner Contest 126
# https://atcoder.jp/contests/abc126
import sys
#import numpy as np

s2nn = lambda s: [int(c) for c in s.split(' ')]
ss2nn = lambda ss: [int(s) for s in ss]
ss2nnn = lambda ss: [s2nn(s) for s in ss]
i2s = lambda: sys.stdin.readline().rstrip()
i2n = lambda: int(i2s())
i2nn = lambda: s2nn(i2s())
ii2ss = lambda n: [sys.stdin.readline().rstrip() for _ in range(n)]
ii2nn = lambda n: ss2nn(ii2ss(n))
ii2nnn = lambda n: ss2nnn(ii2ss(n))

def main():
    N = i2n()
    uvw = ii2nnn(N-1)
    d = [[] for _ in range(N)]
    for u, v, w in uvw:
        b = w % 2 == 0
        d[u-1].append((v-1, b))
        d[v-1].append((u-1, b))
    nn = [-1 for _ in range(N)]
    nn[0] = 0
    def main2(src):
        links = d[src]
        c = nn[src]
        for dst, b in links:
            if nn[dst] == -1:
                nn[dst] = c if b else 1-c
                main2(dst)
    main2(0)
    for n in nn:
        print(n)

main()


Fixed submission:
# AtCoder Beginner Contest 126
# https://atcoder.jp/contests/abc126
import sys
#import numpy as np

s2nn = lambda s: [int(c) for c in s.split(' ')]
ss2nn = lambda ss: [int(s) for s in ss]
ss2nnn = lambda ss: [s2nn(s) for s in ss]
i2s = lambda: sys.stdin.readline().rstrip()
i2n = lambda: int(i2s())
i2nn = lambda: s2nn(i2s())
ii2ss = lambda n: [sys.stdin.readline().rstrip() for _ in range(n)]
ii2nn = lambda n: ss2nn(ii2ss(n))
ii2nnn = lambda n: ss2nnn(ii2ss(n))

def main():
    N = i2n()
    d = [[] for _ in range(N)]
    #uvw = ii2nnn(N-1)
    #for u, v, w in uvw:
    for _ in range(N-1):
        u, v, w = i2nn()
        b = w % 2 == 0
        d[u-1].append((v-1, b))
        d[v-1].append((u-1, b))
    nn = [-1 for _ in range(N)]
    nn[0] = 0
    def main2(src):
        links = d[src]
        c = nn[src]
        for dst, b in links:
            if nn[dst] == -1:
                nn[dst] = c if b else 1-c
                main2(dst)
    #main2(0)
    que = [0]
    que2 = []
    while True:
        if len(que) == 0:
            break
        que2 = []
        for src in que:
            links = d[src]
            c = nn[src]
            for dst, b in links:
                if nn[dst] == -1:
                    nn[dst] = c if b else 1-c
                    que2.append(dst)
        que = que2
    for n in nn:
        print(n)

main()