random_walk 0

Query

import numpy as np

def random_walk(N):
    """
    This function returns the trajectory of an N step random walk on a one dimensional lattice
    """
    a = 1 # lattice spacing
    x0 = 0
    [insert]
    return traj

Output

import numpy as np

def random_walk(N):
    """
    This function returns the trajectory of an N step random walk on a one dimensional lattice
    """
    a = 1 # lattice spacing
    x0 = 0
    traj = np.zeros(N)
    for i in range(N):
        traj[i] = x0
        x0 += a*(2*np.random.randint(2)-1)
    return traj

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