Python3_04. Loops & Functions

1. Cycle & Condition Control

Note:

• • • Each condition is followed by a colon (:), which represents the next block of statements to be executed after the condition is met.

    • Using indentation to divide a statement block, a statement with the same indent number together makes up a block of statements.

    • The break statement can jump out of a for and while loop body.

    • The continue statement is used to tell Python to skip the remaining statements in the current loop block and proceed to the next round of loops.

    • Pass is an empty statement in order to maintain the integrity of the program structure. Pass does not do anything, generally used as a placeholder statement.

Cycling Tips:

• • • When looping through a dictionary, keywords and corresponding values can be interpreted simultaneously using the items () method

    • when looping through a sequence, the index position and the corresponding value can be used Enumerate () functions are also

    • To loop two or more sequences at the same time, you can use zip () Overall Packaging

    • If a reverse loop sequence is required, the sequence is positioned first and then called reversed () function

Operator	Describe
<	Less than
<=	Less than or equal to
>	Greater than
>=	Greater than or equal to
==	Equals, compares objects for equality
!=	Not equal to

2. Functions

Attention:

• • The function code block begins with a def keyword followed by the function identifier name and parentheses ().

  • Any incoming parameters and arguments must be placed in the middle of the parentheses, and the parentheses can be used to define the parameters.

  • The first line of the function statement can optionally use the document string-for storing the function description.

  • The function contents begin with a colon and are indented.

  • return [expression] ends the function, optionally returning a value to the caller. Return without an expression is equivalent to returning None.

Function call:

def function (str): ' Print any incoming string ' (function description) print (str) return ' OK ' function (' I want to invoke this custom function ') (function call) function (' Call again ')

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Python3_04. Loops & Functions