How can I write the for loop in Python as I write it in C:
for(i=0;i<10;)
{
if(i%2==0)
i=i+3;
else
i++;
printf("%d\n",i);
}
Can anyone tell me about this? I searched a lot but couldn't find it. I wrote it like this in Python:
for i in range(0,10):
if (i%2==0):
i+=3
else:
i+=1
print i
Output:
3
2
5
4
7
6
9
8
11
10
Expected output:
3
4
7
8
11
Can anyone also explain the reason of this output?
To write the same loop in Python:
i = 0
while i < 10:
if i % 2 == 0:
i += 3
else:
i += 1
print i
Which gives:
3
4
7
8
11
Note that, per the tutorial:
The
forstatement in Python differs a bit from what you may be used to in C or Pascal. Rather than always iterating over an arithmetic progression of numbers (like in Pascal), or giving the user the ability to define both the iteration step and halting condition (as C), Python’sforstatement iterates over the items of any sequence (a list or a string), in the order that they appear in the sequence.
In a Python for loop, any changes to the loop variable (i, in this case) that occur during the loop are ignored when the loop repeats, and the next value from the object being iterated over is used. In this case, the object is a list of numbers:
>>> range(10) # note that a 0 start is the default
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Some languages call this a for each loop. See also the language reference for more details.
range(0, 10) function returns list of values from 0 to 9:
range(0, 10) == [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Then for body is executed for each element in this list.
If You have 0, the 0 % 2 == 0 so it prints 0 + 3 etc.
In C You changed i value so You jumped to other value in set. Using python's for You will get through all elements. You should use
i = 0
while i < 10:
if (i % 2 == 0):
i += 3
else:
i += 1
print i
To have same results as in C
try this
for i in range(10):
if i%2 == 0:
i = i+3
else:
i = i + 1
print i
it gives the same output u asked for...hope this helps
