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Besides the while statement just introduced, Python knows the usual control flow statements known from other languages, with some twists. Perhaps the most well-known statement type is the if statement. For example:. There can be zero or more elif parts, and the else part is optional. An if … elif … elif … sequence is a substitute for the switch or case statements found in other languages.
The for statement in Python differs a bit from what you may be bandcamp er python tutorial to in C or Pascal. For example no pun intended:.
If you need to modify the sequence you are iterating over while inside the loop for example to duplicate selected itemsit is recommended that you first make a copy. Iterating over a sequence does not implicitly make a copy. The slice notation makes this especially convenient:.
With for w in words: If you do need to iterate over a sequence of numbers, the built-in function range comes in handy. It generates arithmetic progressions:. The given end point is never part of the generated sequence; range 10 generates 10 values, the legal indices for items of a sequence of length To iterate over the indices of a sequence, you can combine range and len as follows:. In most such cases, however, it is convenient to use the enumerate function, see Looping Techniques. We say such an object is iterablethat is, suitable as a target for functions and constructs that expect something from which they can obtain successive items until the supply is exhausted.
We have seen that the for statement is such an iterator. The function list is another; it creates lists from iterables:. The break bandcamp er python tutorial, like in C, breaks out of the innermost enclosing for or while loop. Loop statements may have an else clause; it is executed when the loop terminates through exhaustion of the list with for or when the condition becomes false with whilebut not when the loop is terminated by a break statement.
This is exemplified by the following loop, which searches for prime numbers:. Yes, this is the correct code. Look closely: When used with a loop, the else clause has more in common with the else clause of a try statement than it does that of if statements: For more on the try statement and exceptions, see Handling Exceptions. Mampi ft judy basazibe continue statement, also borrowed from C, continues with the next iteration of the loop:.
The pass statement does nothing. It can be used when a statement is required syntactically but the program requires no action. Another place pass can be used is as a place-holder for bandcamp er python tutorial function or conditional body when 3delight maya crack are working on new code, allowing you to keep thinking bandcamp er python tutorial a more abstract level.
The pass is silently ignored:. The keyword def introduces a function definition. It must be followed by the function name and the parenthesized list of formal parameters. The statements that form the body of the function start at the next line, and must be indented.
More about docstrings can be found in the section Documentation Strings. The execution of a bandcamp er python tutorial introduces a new symbol table used for the local variables of the function. More precisely, all variable assignments in a function store the value in the local symbol table; whereas variable references first look in the local symbol table, then in the bandcamp er python tutorial symbol tables of enclosing functions, then in the global symbol table, and finally in the table of built-in names.
Thus, global variables cannot be directly assigned a value within a function unless named bandcamp er python tutorial a global statementalthough they may be referenced. The actual parameters arguments to a function call are introduced in the local symbol table of the called bandcamp er python tutorial when it is called; thus, arguments are passed using call by value where the value is always an object referencenot the value of the object. A function definition introduces the function name in the current symbol table.
The value of the function name has a type that is recognized by the interpreter as a user-defined function. This value can be assigned to another name which can then also be used as a function.
This serves as a general renaming mechanism:. In fact, even functions without a return statement do return a value, albeit a rather boring one. Writing the value None is normally suppressed by the interpreter if it would be the only value written. You can see it if you really want to using print:. It is simple to write a function that returns a list of the numbers of the Fibonacci series, instead of printing it:. It is also possible to define functions with a variable number of arguments.
There are three forms, which can be combined. The most useful form is to specify a default value for one or more arguments. This creates a function that can be called with fewer arguments than it is defined to allow. This example also introduces the in keyword. This tests whether or not a sequence contains a certain value.
The default values are evaluated at the point of function definition in the defining scope, so that. Important warning: The default value is evaluated only once. This makes a difference when the default is a mutable object such as a list, dictionary, or instances of most classes.
For example, the following function accumulates the bandcamp er python tutorial passed to it on subsequent calls:. For instance, the following function:. This function can be called in any of the following ways:. In a function call, keyword arguments must follow positional arguments. All the keyword arguments passed must match one of the arguments accepted by the function e.
This also includes non-optional arguments e. No argument may receive a value more than once. For example, if we define a function like this:. Note that the order in bandcamp er python tutorial the keyword arguments are printed is guaranteed to match the order in which they were provided in bandcamp er python tutorial function call. Finally, the least frequently used option is to specify that a function can be called with an arbitrary number of arguments.
These arguments will be wrapped up in a tuple see Tuples and Sequences. Before the variable number of arguments, zero bandcamp er python tutorial more normal arguments may occur. Normally, these variadic arguments will be last in the list of formal parameters, because they scoop up all remaining input arguments that are passed to the function. The reverse situation occurs when the arguments are already in a list or tuple but need to be unpacked for a function call requiring separate positional arguments.
For instance, the built-in range function expects separate start and stop arguments. Small anonymous functions can be created with the lambda keyword. This function returns the sum of its two arguments: Lambda functions can be used wherever function objects are required. They are syntactically restricted to a single expression. Semantically, they are just syntactic sugar for a normal function definition.
Like nested function definitions, lambda functions can reference variables from the containing scope:. The above example uses a lambda expression to return a function. Another use is to pass a small function as an argument:. Here are some conventions about the content and formatting of documentation strings. This line bandcamp er python tutorial begin with a capital letter and end with a period.
If there are more lines in the documentation string, the second line should be blank, visually separating the summary from the rest of the description. The Python parser does not strip indentation from multi-line string literals in Python, so tools that process documentation have to strip indentation if desired. This is done using the following convention.
The first non-blank line after the first line of the string determines the amount of indentation for the entire documentation string. Lines that are indented less should not occur, but if they occur all their leading whitespace should be stripped. Equivalence of whitespace should be tested after expansion of tabs to 8 spaces, normally. Function annotations are completely optional metadata information about the types used by user-defined functions see PEP and PEP for more information. Parameter annotations are defined by a colon after the parameter name, followed by an expression evaluating to the value of the annotation.
The following example has a positional argument, a keyword argument, and the return value annotated:. Now that you are about to write longer, more complex pieces of Python, it is a good time to talk about coding style.
Most languages can be written or more concise, formatted in different styles; some are more readable than others. Making it easy for others to read your code is always a good idea, and adopting a nice coding style helps tremendously for that. For Python, PEP 8 has emerged as the style guide that most projects adhere to; it promotes a very readable and eye-pleasing coding style. Every Python developer should read it at some point; here are the most important points extracted for you:.
Tabs introduce confusion, and are best left out. This helps users with small displays and makes it possible to have several code files side-by-side on larger displays.
Use blank lines to separate functions and classes, and larger blocks of code inside functions.
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