nested while loops python

Python BASICS (4): Conditions and loops, python Basics In actual development, if you want to implement certain functions or requirements, some logic is involved, complicated or simple. How can you implement the python syntax? This involves conditions and loops. Obviously, mo

This article is intended to discuss some of the basic syntax in Python through several examples, including basic data types, Python syntax rules, defining variables, loops, conditional judgments, and so on. And make a simple comparison between these features and C (this code is based on Python3)Example 1: Find out the and of 1-100.First give the implementation co

Chapter 2 of python Learning (conditions, loops, and other statements) and Chapter 2 of python1. Simple conditional execution statement (if) Num = int (input ("enter a number \ n ")) If num = 0: Print ("num = 0 \ n ") Else: Print ("num! = 0 \ n ") A slightly more complex execution statement: Num = int (input ("enter a number \ n ")) If num = 0: Print ("num = 0 \ n ") Elif num> 0: Print ("num> 0 \ n ") Else:

construct a tuples parameter. Then, call the python function: pValue = PyObject_CallObject(pFunc, pArgs); After the function is returned, what does pvalue need to be null? Does it need to include a reference to the function return value. Release the reference after checking the returned value! 5.4. Extending Embedded Python So far, the nested

Python core programming 6-conditions and loops, python core programming 1. if statement A single if statement can use the and, or, and not operators. If-elif-else. elif is else if If expression1:Expr1_true_suiteElif expression2:Expr2_true_suiteElse:None_of_the_above_suite 2. while statement While expression:Suite_to_repeat 3. for statement For iter_var in itera

Python BASICS (9): Conditions and loops, 2015 python Condition StatementThe if statement in Python is as follows: if expression:　　expr_true_suite Here, expression can use the boolean operators and, or, and not to implement multiple judgment conditions.If the code block of a compound statement only contains one line of

"num Else: Print "num = 0"Nested code block The if statement can be nested with the if statement: Num = input ("Please input a num :") If num> 0: If num> 5: Print "num> 5" Elif num> 3: Print "num> 3 and num Else: Print "num Elif num If num Print "num Elif num Print "num Else: Print "num> =-4 and num Else: Print "num = 0"More complex condition comparison Operators Expression description X = y x equ

, tuples, and lists) and empty dictionaries are false. Everything else is interpreted as True, including the special value True. Boolean values True and False belong to the boolean type. The bool function can be used to convert other values (like list, str, and tuple. >>> bool('I think, therefore I am')True>>> bool(42)True>>> bool('')False>>> bool(0)FalseBecause all values can be used as boolean values, there is almost no need to display and convert them (it can be said that

will produce an error. here, if you use the PASS statement, you can pass the syntax requirements and have no other effect. (2) del statementby assigning A to none, a point-to-list (' A12 ', ' b34 ', ' c456 ') is cut off. But a as an object still floats in memory. you need to use the DEL statement to remove object A. for lists [' A12 ', ' b34 ', ' c456 ') This cannot be deleted in Python. We use the DEL statement to simply remove the reference to an o

') ' Bob ' >>> Adict.get (' Email ', ' Not found ') ' not found ' Dict.items (): Returns a list containing the dictionary (key, Value) to the tuple Dict.keys (): Returns a list containing the keys in the dictionary>>> Adict.keys ()[' QQ ', ' age ', ' name ']Dict.values (): Returns a list that contains all the values in the dictionary>>> adict.values ()[' 2222333 ', ' Bob ']Dict.update (dict2): adds a dictionary dict2 key-value pair to the dictionary Dict>>> adict.update ({' phone ':

This article mainly introduces conditions and loops in python to obtain any key-value pairs in the dictionary. >>> x={'a':1,'b':2}>>> key,value=x.popitem()>>> key,value('a', 1)>>> del x[key]Traceback (most recent call last): File " ", line 1, in del x[key]KeyError: 'a'>>> x{'b': 2}>>> x[key]=value>>> x{'a': 1, 'b': 2}>>> del x[key] Incremental assignment >>> x=2>>> x+=1>>> x*=2>>> x>>>

sequence query like a if-elif-else statement or a for loop.As you can see, the solution in Python is more powerful and concise for implementing the same functionality. 4. Conditional expressions (ternary operators) syntax : X if C else Y Use the following:>>> x, y =4, 3>>> smaller = x if x 5.while statements Grammar While Expression:suite_to_repeat Counting loops