I've seen some examples using tuples and dictionaries but they don't seem to return the same varialbe. if integerLength == 1: n = 1 elif integerLength == 2: n = 10 elif integerLength == 3: n = 100 elif integerLength == 4: n = 1000 elif integerLength == 5: n = 10000 else: n = 100000 Python Nested if statement. you can implement an if-else conditional but no elif inside a dict-comprehension (or any other comprehension). Python allows us to stack any number of if statements inside the block of another if statements. Questions: This question already has an answer here: if/else in Python's list comprehension? The syntax of the if...else statement is −. To learn more about dictionary, please visit Python Dictionary. The whole point of a dictionary is that it's runtime is constant, but these comprehensions are linear both in time and space. In very simple words, Nested if statements is an if statement inside another if statement. The else statement is an optional statement and there could be at most only one else statement following if.. Syntax. In that case, you may use the IF, ELIF and ELSE in Python: A dictionary comprehension takes the form {key: value for (key, value) in iterable}. 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. In Python, a dictionary is an unordered collection of items. Can we include the elif in our list comprehension, in a similar fashion to the code above? Merge two dictionaries in a single expression in Python; Now let’s add another layer. dict['rest'] if len([dict[i] for i in dict if i==n] )==0 else [dict[i] for i in dict if i==n][0] Not only is it not Pythonic, it's inefficient. 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? An else statement can be combined with an if statement. Like List Comprehension, Python allows dictionary comprehensions.We can create dictionaries using simple expressions. Example 2: IF, ELIF and ELSE in Python. 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.. They are also a great alternative to using maps and filters within python. Let’s see a example,lets assume we have two lists named keys and value now, In Python, a nested dictionary is a dictionary inside a dictionary. The sequence of the check in the following order. Python comprehensions are a very natural and easy way to create lists, dictionary, and sets. 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 if/else list comprehension (generator expression) - Python if else list comprehension (generator expression).py For example, an answer like: ['yes', 'no', 'idle', 'idle', 'idle'] Up until now, I have only used if and else in list comprehension. Dict comprehensions can use complex expressions and IF-ELSE constructs too. Here, dictionary has a key:value pair enclosed within curly brackets {}. 3 answers Answers: >>> l = [22, 13, 45, 50, 98, 69, 43, 44, 1] >>> [x+1 if x >= 45 else x+5 for x in l] [27, 18, 46, 51, 99, 70, 48, 49, 6] Do-something if , else do-something else. 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. 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