Buggy python submission (verdict: Time Limit Exceeded):
import sys
from collections import defaultdict
import numpy as np

sys.setrecursionlimit(10 ** 6)
int1 = lambda x: int(x) - 1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.readline())
def MI(): return map(int, sys.stdin.readline().split())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def SI(): return sys.stdin.readline()[:-1]

def main():
    md=10**9+7
    n=II()
    aa=LI()
    cs=[0]
    for a in aa:cs.append(cs[-1]^a)
    #print(cs)
    cnt=np.zeros((2,max(cs)+1),dtype="i8")
    cnt[0]=1
    for s in cs[1:]:
        if s==0:
            cnt[0]+=cnt[1]
        else:
            cnt[1][s]+=cnt[0][s]
    #print(cnt)
    if cs[-1]==0:print(np.sum(cnt[1])+pow(2,cs.count(0)-2,md))
    else:print(cnt[0][cs[-1]])

main()

Fixed submission:
import sys

sys.setrecursionlimit(10 ** 6)
int1 = lambda x: int(x) - 1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.readline())
def MI(): return map(int, sys.stdin.readline().split())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def SI(): return sys.stdin.readline()[:-1]

def main():
    md=10**9+7
    n=II()
    aa=LI()
    cs=[0]
    for a in aa:cs.append(cs[-1]^a)
    #print(cs)

    cnt={}
    cnt0=[1]*len(cs)
    for i,s in enumerate(cs[1:],1):
        if s==0:
            cnt0[i]=cnt0[i-1]+1
        elif s in cnt:
            cnt0[i]=cnt0[i-1]
            c0=cnt0[i]-cnt0[cnt[s][2]]
            cnt[s][0]=(cnt[s][0]+cnt[s][1]*c0)%md
            cnt[s][1]=(cnt[s][1]+cnt[s][0])%md
            cnt[s][2]=i
        else:
            cnt0[i]=cnt0[i-1]
            cnt[s]=[1,1,i]
    #print(cnt)
    #print(cnt0)

    if cs[-1]==0:ans=sum(v[1] for v in cnt.values())+pow(2,cnt0[-1]-2,md)
    else:ans=cnt[cs[-1]][0]
    print(ans%md)

main()

Buggy python submission (verdict: Time Limit Exceeded):
def cnt(l, r, x):
    if r == n - 1:
        return 1
    t = (l, r, x)
    if t in memo:
        return memo[t]
    re = 0
    dpi = dp[r + 1]
    for j in range(r + 1, n):
        if dpi[j] == x:
            re += cnt(r + 1, j, x)
    memo[t] = re
    return re

memo = {}
md = 10 ** 9 + 7
n = int(input())
a = list(map(int, input().split()))
dp = [[0] * n for _ in range(n)]
for i in range(n):
    dp[i][i] = a[i]
for i, dpi in enumerate(dp):
    s = dpi[i]
    for j in range(i + 1, n):
        dpi[j] = s = s ^ a[j]
ans = 0
for r in range(n):
    ans = (ans + cnt(0, r, dp[0][r])) % md
print(ans)


Fixed submission:
import sys

sys.setrecursionlimit(10 ** 6)
int1 = lambda x: int(x) - 1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.readline())
def MI(): return map(int, sys.stdin.readline().split())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def SI(): return sys.stdin.readline()[:-1]

def main():
    md=10**9+7
    n=II()
    aa=LI()
    cs=[0]
    for a in aa:cs.append(cs[-1]^a)
    #print(cs)

    cnt={}
    cnt0=[1]*len(cs)
    for i,s in enumerate(cs[1:],1):
        if s==0:
            cnt0[i]=cnt0[i-1]+1
        elif s in cnt:
            cnt0[i]=cnt0[i-1]
            c0=cnt0[i]-cnt0[cnt[s][2]]
            cnt[s][0]=(cnt[s][0]+cnt[s][1]*c0)%md
            cnt[s][1]=(cnt[s][1]+cnt[s][0])%md
            cnt[s][2]=i
        else:
            cnt0[i]=cnt0[i-1]
            cnt[s]=[1,1,i]
    #print(cnt)
    #print(cnt0)

    if cs[-1]==0:ans=sum(v[1] for v in cnt.values())+pow(2,cnt0[-1]-2,md)
    else:ans=cnt[cs[-1]][0]
    print(ans%md)

main()