Python list comprehensions

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by RS admin@ycp.powersoftwo.org

1. Python list comprehensions

Create a list of the first 10 even numbers starting with 0 (zero) and then print out the list as a string all on one line.

2. Even number list

Here is the Python code.

list1 = []
for i1 in range(0,10):
	list1.append(2*i1)

s1 = ""
for i1 in list1:
	s1 += " " + str(i1)
print("{0:s}".format(s1))

Here is the output of the Python code.

 0 2 4 6 8 10 12 14 16 18

Here is the Python code.

list1 = [2*i1 for i1 in range(0,10)]
s1 = " ".join("{0:d}".format(i1) for i1 in list1)
print("{0:s}".format(s1))

Here is the output of the Python code.

0 2 4 6 8 10 12 14 16 18

3. Concatenation

When converting lists into strings, do not use the concatenation operator "+" (even though it works).

Instead, use the join method of the string data type (class).

4. End of page

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by RS admin@ycp.powersoftwo.org