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List Methods in Python | Set 1 (in, not in, len(), min(), max()…)
• Difficulty Level : Easy
• Last Updated : 18 Sep, 2018

List basics have been covered in python in the set below

Data Types-List, Tuples and Iterations

1. “in” operator :- This operator is used to check if an element is present in the list or not. Returns true if element is present in list else returns false.

2. “not in” operator :- This operator is used to check if an element is not present in the list or not. Returns true if element is not present in list else returns false.

 `# Python code to demonstrate the working of ` `# "in" and "not in"  ` `# initializing list ` `lis ``=` `[``1``, ``4``, ``3``, ``2``, ``5``] ` ` `  `# checking if 4 is in list using "in" ` `if` `4` `in` `lis: ` `        ``print` `(``"List is having element with value 4"``) ` `else` `:  ``print` `(``"List is not having element with value 4"``) ` ` `  `# checking if 4 is not list using "not in" ` `if` `4` `not` `in` `lis: ` `        ``print` `(``"List is not having element with value 4"``) ` `else` `:  ``print` `(``"List is having element with value 4"``) `

Output:

```List is having element with value 4
List is having element with value 4
```

3. len() :- This function returns the length of list.

4. min() :- This function returns the minimum element of list.

5. max() :- This function returns the maximum element of list.

 `# Python code to demonstrate the working of ` `# len(), min() and max() ` `# initializing list 1 ` `lis ``=` `[``2``, ``1``, ``3``, ``5``, ``4``] ` ` `  `# using len() to print length of list ` `print` `(``"The length of list is : "``, end``=``"") ` `print` `(``len``(lis)) ` ` `  `# using min() to print minimum element of list ` `print` `(``"The minimum element of list is : "``, end``=``"") ` `print` `(``min``(lis)) ` ` `  `# using max() to print maximum element of list ` `print` `(``"The maximum element of list is : "``, end``=``"") ` `print` `(``max``(lis)) `

Output:

```The length of list is : 5
The minimum element of list is : 1
The maximum element of list is : 5
```

6. “+” operator :- This operator is used to concatenate two lists into a single list.

7. “*” operator :- This operator is used to multiply the list “n” times and return the single list.

 `# Python code to demonstrate the working of ` `# "+" and "*" ` `# initializing list 1 ` `lis ``=` `[``1``, ``2``, ``3``] ` ` `  `# initializing list 2 ` `lis1 ``=` `[``4``, ``5``, ``6``] ` ` `  `# using "+" to concatenate lists ` `lis2``=` `lis ``+` `lis1 ` ` `  `# priting concatenated lists ` `print` `(``"list after concatenation is : "``, end``=``"") ` `for` `i ``in` `range``(``0``,``len``(lis2)): ` `         ``print` `(lis2[i], end``=``" "``) ` `          `  `print` `(``"\r"``) ` ` `  `#using '*' to combine lists  ` `lis3 ``=` `lis ``*` `3` ` `  `# priting combined lists ` `print` `(``"list after combining is : "``, end``=``"") ` `for` `i ``in` `range``(``0``,``len``(lis3)): ` `         ``print` `(lis3[i], end``=``" "``) `

Output:

```list after concatenation is : 1 2 3 4 5 6
list after combining is : 1 2 3 1 2 3 1 2 3
```

8. index(ele, beg, end) :- This function returns the index of first occurrence of element after beg and before end.

9. count() :- This function counts the number of occurrences of elements in list.

 `# Python code to demonstrate the working of ` `# index() and count() ` `# initializing list 1 ` `lis ``=` `[``2``, ``1``, ``3``, ``5``, ``4``, ``3``] ` ` `  `# using index() to print first occurrence of 3 ` `# prints 5 ` `print` `(``"The first occurrence of 3 after 3rd position is : "``, end``=``"") ` `print` `(lis.index(``3``, ``3``, ``6``)) ` ` `  `# using count() to count number of occurrence of 3 ` `print` `(``"The number of occurrences of 3 is : "``, end``=``"") ` `print` `(lis.count(``3``)) `

Output:

```The first occurrence of 3 after 3rd position is : 5
The number of occurrences of 3 is : 2
```

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