I've seen some examples using tuples and dictionaries but they don't seem to return the same varialbe. Python allows us to stack any number of if statements inside the block of another if statements. The else statement is an optional statement and there could be at most only one else statement following if.. Syntax. you can implement an if-else conditional but no elif inside a dict-comprehension (or any other comprehension). Now let’s add another layer. A dictionary comprehension takes the form {key: value for (key, value) in iterable}. Let’s see a example,lets assume we have two lists named keys and value now, Python comprehensions are a very natural and easy way to create lists, dictionary, and sets. Specifically, let’s say that you want to include another discount group – the ‘Junior Discount’ group – for people who are below the age of 18.. Here, we have added nested if..elif..else inside the else block using ternary expression. An else statement contains the block of code that executes if the conditional expression in the if statement resolves to 0 or a FALSE value.. In Python, a dictionary is an unordered collection of items. The ternary form of the if/else operator doesn’t have an ‘elif’ built in, but you can simulate it in the ‘else’ condition: ['yes' if v == 1 else 'no' if v == 2 else 'idle' for v in l] This is like saying: Python Nested if statement. In Python, a nested dictionary is a dictionary inside a dictionary. Example 2: IF, ELIF and ELSE in Python. An else statement can be combined with an if statement. They are also a great alternative to using maps and filters within python. The whole point of a dictionary is that it's runtime is constant, but these comprehensions are linear both in time and space. Python if/else list comprehension (generator expression) - Python if else list comprehension (generator expression).py Like List Comprehension, Python allows dictionary comprehensions.We can create dictionaries using simple expressions. Merge two dictionaries in a single expression in Python; For example, an answer like: ['yes', 'no', 'idle', 'idle', 'idle'] Up until now, I have only used if and else in list comprehension. If you need that, it would be better to drop the dict-comprehension - Ma0 @Ev.Kounis so the only way to do it is just avoid dict-comprehension? In very simple words, Nested if statements is an if statement inside another if statement. The syntax of the if...else statement is −. Dict comprehensions can use complex expressions and IF-ELSE constructs too. Can we include the elif in our list comprehension, in a similar fashion to the code above? Note: Core Python doesn’t support switch-case statements that are available in other programming languages but we can use the elif ladder instead of switch cases. To learn more about dictionary, please visit Python Dictionary. In that case, you may use the IF, ELIF and ELSE in Python: Questions: This question already has an answer here: if/else in Python's list comprehension? Here, dictionary has a key:value pair enclosed within curly brackets {}. 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