I have a list L of elements, say natural numbers. I want to print them in one line with a single space as a separator. But I don't want a space after the last element of the list [or before the first].
In Python 2, this can easily be done with the following code. The implementation of the print statement [mysteriously, I must confess] avoids to print an extra space before the newline.
L = [1, 2, 3, 4, 5]
for x in L:
print x,
print
However, in Python 3 it
seems that the [supposedly] equivalent code using the print function produces a space after the last number:
L = [1, 2, 3, 4, 5]
for x in L:
print[x, end=" "]
print[]
Of course there are easy answers to my question. I know I can use string concatenation:
L = [1, 2, 3, 4, 5]
print[" ".join[str[x] for x in L]]
This is a quite good solution, but compared to the Python 2 code I find it counter-intuitive and definitely slower. Also, I know I can choose whether to print a space or not myself, like:
L = [1, 2, 3, 4, 5]
for i, x in enumerate[L]:
print[" " if i>0 else "", x, sep="", end=""]
print[]
but again this is worse than what I had in Python 2.
So, my
question is, am I missing something in Python 3? Is the behavior I'm looking for supported by the print function?
Write a Python program to print a list of space-separated elements.Python List: Exercise - 62 with Solution
Sample Solution:-
Python Code:
num = [1, 2, 3, 4, 5]
print[*num]
Sample Output:
1 2 3 4 5
Flowchart:
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To convert a space-separated string to a list in Python, call the Output: This works because the Let’s then take a look at how to split a
string of integers into a list of integers.str.split[] method:sentence = "This is a test"
words_list = sentence.split[]
print[words_list]
['This', 'is', 'a', 'test']
str.split[] splits the string by blank spaces by default.
To convert a space-separated string of integers to a list in Python:
- Split the string on empty spaces.
- Convert each element to an integer.
- Add each integer to a list.
You can do this with a for loop:
numbers_str = "1 2 3 4 5"
numbers_list = []
for num_str in numbers_str.split[]:
num_int = int[num_str]
numbers_list.append[num_int]
print[numbers_list]Output:
[1, 2, 3, 4, 5]
To make the expression way shorter, you can use a list comprehension:
numbers_str = "1 2 3 4 5" numbers_list = [int[num] for num in numbers_str.split[]] print[numbers_list]
Output:
[1, 2, 3, 4, 5]
Conclusion
Thanks for reading. I hope you found the answer you were looking for.
Happy coding!
Further Reading
Python Tricks
Python List Comprehensions