The sequence of the check in the following order. Here, dictionary has a key:value pair enclosed within curly brackets {}. Like List Comprehension, Python allows dictionary comprehensions.We can create dictionaries using simple expressions. Merge two dictionaries in a single expression in Python; In Python, a nested dictionary is a dictionary inside a dictionary. The syntax of the if...else statement is −. 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. A dictionary comprehension takes the form {key: value for (key, value) in iterable}. To learn more about dictionary, please visit Python Dictionary. In that case, you may use the IF, ELIF and ELSE in Python: Here, we have added nested if..elif..else inside the else block using ternary expression. 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 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. Example 2: IF, ELIF and ELSE in Python. Python Nested if statement. 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. An else statement can be combined with an if statement. Can we include the elif in our list comprehension, in a similar fashion to the code above? 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 allows us to stack any number of if statements inside the block of another if statements. 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? They are also a great alternative to using maps and filters within python. For example, an answer like: ['yes', 'no', 'idle', 'idle', 'idle'] Up until now, I have only used if and else in list comprehension. 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.. In very simple words, Nested if statements is an if statement inside another if statement. you can implement an if-else conditional but no elif inside a dict-comprehension (or any other comprehension). Python comprehensions are a very natural and easy way to create lists, dictionary, and sets. The else statement is an optional statement and there could be at most only one else statement following if.. Syntax. Let’s see a example,lets assume we have two lists named keys and value now, Python if/else list comprehension (generator expression) - Python if else list comprehension (generator expression).py I've seen some examples using tuples and dictionaries but they don't seem to return the same varialbe. Now let’s add another layer. Dict comprehensions can use complex expressions and IF-ELSE constructs too. The whole point of a dictionary is that it's runtime is constant, but these comprehensions are linear both in time and space. 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