Как вывести построчно заданные повторы символов?

a=[]
i = 0
while i<7:
    a[i]=int(raw_input)
    i=i+1
i=0
while i<7:
    if a[i]>0:
        print a[i]
        j=0
        while j=<a[i]:
            print "X"
else:print a[i]

a = []
i = 0
while i < 6:
    a[i] = int(raw_input)
    i = i + 1
i = 0
while i < 6:
    if a[i] > 0:
        print a[i]
        j = 0
        while j <= a[i]:
            print "X"
else:
    print a[i]

a = []
i = 0
while i < 6:
    a[i] = int(raw_input)
    i = i + 1
i = 0
while i < 6:
    if a[i] > 0:
        print a[i]
        j = 0
        while j <= a[i]:
        print "X"
    else:
        print a[i]

a = []
i = 0
while i < 6:
    a[i] = int(raw_input)
    i = i + 1
i = 0
while i < 6:
    if a[i] > 0:
        print a[i]
        j = 0
        while j <= a[i]: # Вот тут как-то странно, что-то написано...
        print "X"
    else:
        print a[i]

TypeError: int() argument must be a string or a number, not 'builtin_function_or_method'

a[i] = int(raw_input())

IndexError: list assignment index out of range

a = [int(input()) for _ in range(6)]
for i in a:
    if i > 0:
    print i, ' ',
        for j in a:
        print 'X',
        print
    else:
    print i

a = []
i = 0
while i < 6:
    a[i] = int(raw_input("Введите 7 чисел"))
    i = i + 1
i = 0
while i < 6:
    if a[i] > 0:
        print ((a[i]))
        j = 0
        m = a[i]
        while j <= m:
            print ("X")
    else:
        print ((a[i]))

a = [int(input()) for _ in range(6)]
for i in a:
    print i,
    if i > 0:
    print 'X' * i
    else:
    print