data=[
    ["Bob",56,89],
    ["Jackaforius",56,33],
    ["Nora",90,56]
    ]

#calc num of rows
num_rows=len(data)
print("num_rows",num_rows)

#calc of columns
num_cols=len(data[0])
first_row=data[0]
num_cols=len(first_row)
print("num_cols",num_cols)

#print them all out
for x in range(0,num_rows):
    print(data[x])

#print out nicely
for x in range(0,num_rows):
    print(data[x][0]+"\t"+str(data[x][1])+"\t"+str(data[x][2])  )

#print out nicely and efficiently
print("#print out nicely and efficiently")
for x in range(0,num_rows):
    for y in range(num_cols):
        print(str(data[x][y])+"\t",end="" )
    print()
    #input("Press ENTER to continue ")

#print out nicely and efficiently 2
print("#print out nicely and efficiently 2")
for row in data:
    for y in range(num_cols):
        print(str(row[y])+"\t",end="" )
    print()

#print out nicely and efficiently 3
print("#print out nicely and efficiently 3")
for row in data:
    for cell in row:
        print(str(cell)+"\t",end="" )
    print()

#without the print end trick
#construct a string and then print it out
print("#print out using a string")
s=""
for row in data:
    for cell in row:
        s=s+str(cell)+"\t"
    s=s+"\n"
print(s)


#without the print end trick
#using string formatting
print("#print out using a string, using string formatting")
s=""
for row in data:
    for cell in row:
        s=s+"{:<15}".format(cell)  #https://docs.python.org/3.4/library/string.html
    s=s+"\n"
print(s)

#list comprehension - the cool way to create lists on the fly
g=[str(i) for i in range(20)]
print(g)

#the non-cool way
h=[]
for i in range(20):
    h.append(str(i) )

# a few more examples of lists
g1="\t".join([str(i) for i in range(20)] )
print(g1)
print(",".join(h))

print([int(x)*2 for x in h])