nested while loops python

Common Loop Structure is a for statement that iterates over multiple items , loops are one of the most important features of Python, and the most common iteration is simply looping through all members of a sequence (string, list, or tuple) 1, Iteration list:For n in [1,2,3,4,5,6,7,8,9]: Print ("number:%d value:%d"% (n,2*n))Output Result:Number:1 Value:2Number:2 Value:4Number:3 Value:6Number:4 Value:8Number:

A common loop structure is a for statement that iterates over multiple items, and the loop is one of the most important features of Python, and the most common iteration is simply to loop through all the members of a sequence (string, list, or tuple) 1, Iteration list: For n in [1,2,3,4,5,6,7,8,9]: print ("number:%d value:%d"% (n,2*n)) Output Result: Number:1 value:2number:2 value:4number:3 value:6number:4 value:8number:5 value:10number:6 value:12

Python 2.7.5 (default, May, 22:43:36) [MSC v.1500 + bit (Intel)] on Win32#chapter 5 conditions, loops and other statements #5.1 print and import A lot of other information # for very many applications, using the logging module to log logs is more appropriate than the print statement #5.1.1 use a comma output # to see that each number of participants has voluntarily inserted a space character >>> print ' Age

][11, 9, 9, 9, 23, 9, 7, 11]>>> [(x+1,y+1) for x in range (3) for Y in range (5)][(1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (2, 1), (2, 2), (2,3), (2, 4), (2, 5), (3, 1), (3, 2), (3, 3), (3, 4), (3, 5)]Viii. Generator ExpressionA builder expression is an extension of list resolutionBasic syntax:(Expr for Iter_var in iterable if cond_expr)Practical Examples:>>>x_product_pairs = ((i, j) for I in rows for J in Cols ())>>>type (X_product_pairs)>>>for I in X_product_pairs:... print I...(0,0)(0,1).

Python multi-dimensional/nested Dictionary data infinite traversal implementation, python multi-dimensional Recently I picked up Django and learned how to traverse multi-dimensional Dictionary data in the instance practice. Google does not query related information... After all, I was a newbie. When I started my work, I found that it was not just as simple as I t

Listcomprehension in python is generally used to calculate another list from one list. It is a combination of mapfilter functions and can be implemented cyclically. Some people have said that list derivation is only syntactic sugar, and that list derivation is more efficient than loop and mapfilter (only one test result is given, no relevant analysis), and other valuable information will not be found... this is a question asked by an interviewer. I 'd

, When there is no break8, According to user demand output line and width:H=int (Input ("Height:"))W=int (Input ("width:"))Nh=1While NhNw=1 width must be changed once per line, so it is placed within the while loopWhile NwPrint ("#", end= "")Nw+=1 across the line.Print () line breakNh+=1Note: Nesting loops, writing simple loops, and substituting ideas into another loop9, 99 multiplication table:Hang=1Whil

There are two loops in Python, namely A For loop and a while loop, which iterate over the data of the sequence: For loop The For loop iterates through each element of a list, tuple, or string, for example: names = ["zhangcong""lisanjiang" "Pangzhiguo "] for in names: print name # Execution Results ZhangconglisanjiangpangzhiguoSo for the X in ... A loop is a statement that assigns each element to a vari

1, the difference of Python2\python3: Python2\python3 difference:One, code duplication, Python2 code repetition function reuse, inclusion of other language parts, not standardizedPython3 to be integrated, simple and beautifulCompile: Compile all the code into binary once and then run it again.Cons: Low development efficiency, no cross-platformInterpreted: When the program starts executing, the code is interpreted as a line of binary, executed.Cons: Low development efficiencyPython is a bit:1, th

small! ") Count+ = 1Else: ifCount = = 3: Print("Too many mistakes! ")2.1.2 Continue skip the cyclecode example:i = 1while i 　　2.2 for LoopThe For loop requires a pre-set number of cycles (n), and then executes the statement that is subordinate to the for (n) times.code example:For I in range: print (i) #输出0 1 2 3 4 5 6 7 8 9The while Loop Judgment statement code example:AGE_OF_CC = 27count =0while Count For condition Judgment code example:AGE_OF_CC = 27count = 0for i in range (3):

First look at the for structure:# !/usr/bin/python # -*-coding:utf-8-*- for in range (1): Print iOutput:0Input and output:# !/usr/bin/python # -*-coding:utf-8-*- for in range (1, ten): Print i#输出: 1 2 3 4 5 6 7 8 9Input and output:# !/usr/bin/python # -*-coding:utf-8-*- for in range (1, 2): print i,# output: 1 3 5 7 9Summarize:The meaning of the r

user select the item according to the serial number, add the shopping cartpurchase, if the total amount of goods is greater than the total assets, indicating that the account balance is insufficient, otherwise, the purchase succeeds.Add: can recharge, a product to remove the shopping cartgoods = [{"name": "computer", "price": 1999},{"name": "mouse", "price": 10},{"name": "yacht", "price": 20},{"name": "beauty", "price": 998},]V. User interaction, showing the choice of three-level linkage betwee

user select the item according to the serial number, add the shopping cartpurchase, if the total amount of goods is greater than the total assets, indicating that the account balance is insufficient, otherwise, the purchase succeeds.Add: can recharge, a product to remove the shopping cartgoods = [{"name": "computer", "price": 1999},{"name": "mouse", "price": 10},{"name": "yacht", "price": 20},{"name": "beauty", "price": 998},]V. User interaction, showing the choice of three-level linkage betwee

Beginning Python From Novice to Professional (5)-conditions and loops Conditions and loops Conditional execution: name = raw_input('What is your name? ')if name.endswith('Gumby'):print 'Hello, Mr.Gumby' What is your name? GumbyHello, Mr.Gumby name = raw_input('What is your name? ')if name.endswith('Gumby'):print 'Hello, Mr.Gumby'else:print 'Hello, stranger'Multi