Is it not possible to begin a for loop by 1 instead of 0

[sylas]

Hi all ! With C++ no problem, I can begin a for loop by 1. I should like to delete all multipilcations by 0, as we find multiplication tables in a school.

print("MULTIPLICATION TABLE")

M=[[0,1,2,3,4,5,6,7,8,9],
   [1,1,1,1,1,1,1,1,1,1],
   [2,2,2,2,2,2,2,2,2,2],
   [3,3,3,3,3,3,3,3,3,3],
   [4,4,4,4,4,4,4,4,4,4],
   [5,5,5,5,5,5,5,5,5,5],
   [6,6,6,6,6,6,6,6,6,6],
   [7,7,7,7,7,7,7,7,7,7],
   [8,8,8,8,8,8,8,8,8,8],
   [9,9,9,9,9,9,9,9,9,9]]


for i in range (len(M)):
   for j in range (len(M)):
      M[i][j] =i*j


for x in range (len(M)):
   print(M[x])

[zivoni]

range accepts additional argument for starting value of sequence; you can use

for i in range(1, 4):
   print(i)

to get

Output:
1
2
3

[sylas]

Thanks . With "for x in range (1,10)" in the print statement, I only suppressed the fist line. How to soppress leading zeros of all following lines ?
Here is my output:
/usr/bin/python3.5 /home/sylvain/PycharmProjects/Py4/lambda.py
MULTIPLICATION TABLE
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
[0, 2, 4, 6, 8, 10, 12, 14, 16, 18]
[0, 3, 6, 9, 12, 15, 18, 21, 24, 27]
[0, 4, 8, 12, 16, 20, 24, 28, 32, 36]
[0, 5, 10, 15, 20, 25, 30, 35, 40, 45]
[0, 6, 12, 18, 24, 30, 36, 42, 48, 54]
[0, 7, 14, 21, 28, 35, 42, 49, 56, 63]
[0, 8, 16, 24, 32, 40, 48, 56, 64, 72]
[0, 9, 18, 27, 36, 45, 54, 63, 72, 81]

[zivoni]

print M[x][1:] instead of M[x]. Actually you dont need to use range to remove first elements, you can use

for row in M[1:]:
   print(row[1:])

[sylas]

Thanks again. Now I have a good multiplication table. Last question: is it possible to avoid the matrix I have on the top of the file ?

[buran]

Of course, you can use list comprehension

multiplication_table = [[x*y for y in range(1,10)] for x in range(1,10)]
print(multiplication_table)

in any case, no need to create the table in advance and then change each element

multiplication_table = []
for x in range(1,10):
    new_row = []
    for y in range(1,10):
        new_row.append(x*y)
    multiplication_table.append(new_row)
print(multiplication_table)

[sylas]

Thanks to Buran. Indeed python language is very strong, and therefor hard to leatn.

[wavic]

These are the range arguments: range(start, stop, step).

In [1]: for num in range(2, 21, 2):
   ...:     print(num, end=" ")
   ...:     
2 4 6 8 10 12 14 16 18 20