Python Pascal Triangle code

#PASCAL TRIANGLE
no = int(input("Enter the number of rows: "))
n = 1 #variable n representes the current row
while n <= no: #loop checking for each row
    totalterms = n + 1 #total terms in a row
    term = 0 # current term (or also known as r)
    line = "" #the row in string form
    n_num = 1 #n!
    n_r = 1 #(n-r)!
    r = 1 #r!
    while term < totalterms: #calculating coefficient of each term in a row consecutively through a loop
        j = 1 #j, u, and p are variables for calculating factorials
        for j in range(1, n + 1): #n! calculation loop
            n_num *= j
        u = 1
        for u in range(1, (n - term) + 1): #(n-r)! calculation loop
            n_r *= u
        p = 1
        for p in range(1, term + 1): #r! calculation loop
            r *= p
        line = line + str(n_num//(n_r * r)) + " " #adding the calculated coefficient to the row one after another
        term += 1
        n_num = 1 #resetting the n! value for the next calculation
        n_r = 1 #resetting the (n-r)! value for the next calculation
        r = 1 #resetting the r! value for the next calculation
    #s = n - no
    s = 0
    while s < (no - n): #loop to add spaces to each row so that they all form a triangle
        line = " " + line
        s += 1
    print(line) #print the row finally
    n += 1