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the output result is right aligned. The length of 2.300 is 5, so there is a space in front. >>> print("%+10x" % 10) +a # X indicates hexadecimal notation, with a display width of 10 and eight leading Spaces >>>print("%-5x" % -10)-a # "%-5x" negative signs are left aligned, and the display width is 5. Therefore, there are 3 spaces behind- >>> Pi = 3.1415 >>> print ("the pi value is % s" % pi) The pi value is 3.1415. >>> Print ("pi value is %. 8f"

number (depending on display length)Percent% character "%"The format can be further controlled in the following ways:%[(name)][flags][width]. [Precision]typecode(name) is namedFlags can have +,-, ' or 0. + Indicates right alignment. -Indicates left alignment. ' is a space that fills a space on the left side of a positive number to align with a negative number. 0 means using 0 padding.Width indicates display widthsPrecision indicates the precision after the decimal pointLike what:Print ("%+

tuple, Instead, it determines whether the loop ends with an expression. For example, to print an integer no greater than n from 0: n = 10x = 0 while x N: print x x = x + 1while cycle first evaluates x N, if true, the The code block of the line loop body, otherwise, exits the loop. In the loop body, x = x + 1 causes X to increase, eventually because x sum =1 while x: if x%2==1: sum+ =x; X+ +; Print sumBreak exits the loop wit

whether the loop ends with an expression. For example, to print an integer no greater than N from 0:n = 10x = 0 whilex : print x x = x + 1 The while loop first evaluates x true, executes the block of code for the loop body, otherwise, exits the loop. In the loop,x = x + 1 causes x to increase and eventually exits the loop because x Without this statement, thewhile loop always evaluates to True for x , it loops indefinitely and becomes a dead lo

(width) returns: Width-length string, right-aligned the original string into the string, and other vacant spaces.2. String Formatting When formatting a string, Python uses a string as a template. There are formatting characters in the template that reserve locations for real values and describe the format in which real values should be rendered. Python uses a tuple to pass multiple values to the template, each of which corresponds to a format character. For example: print("I‘m %s. I‘m %d year o

scientific mode, press the Int button.S. Press sin in scientific mode.O in scientific mode, press cos.T. Press tan in scientific mode.M. Press dms in scientific mode.P. In scientific mode, press pi.V press F-E button in scientific modeX press the Exp button in scientific modeQ: In scientific mode, press x ^ 2.Y: in scientific mode, press x ^ y.# Press x ^ 3 in scientific modeL press log in scientific mode! In scientific mode, press n! ButtonCtrl + Y press y radic; x in scientific modeCtrl + B

Format characterThe format character reserves the location for the real value and controls the format of the Display. A format character can contain a type code that controls the type of display, as Follows:%s string (shown with str ())%r string (shown with Repr ())%c single character%b binary integers%d decimal integers%i Decimal Integer%o Eight-binary integers%x hexadecimal integer%e index (base written as E)%E index (base written as E)%f floating Point%F floating-point number, same as above%g

Memory management: After the Python variable is re-assigned, the corresponding memory address will changeReference countDel is unboundMemory address multiplexing>>> x=1>>> id(x)9310240>>> x=2>>> id(x)9310272>>> y=1>>> id(y)9310240String Formatting control charactersprint(‘用户名是： %s 密码是： %s‘ %)Print with while loop 1 2 3 4 5 6 8 9 10x = 1print(‘Now, Print the numbers: ‘, end=‘ ‘)while x Method Twoprint(‘\n‘)x = 0while x Ask for 1-100 andprint(‘\n‘)y = 1

1. HadoopIt would is impossible to talk about open source data analytics without mentioning Hadoop. This Apache Foundation project have become nearly synonymous with big data, and it enables large-scale distributed processi Ng of extremely large data sets. A survey conducted by TDWI and SAS found this nearly percent of enterprises expected to has Hadoop clusters in product Ion by the end of 2016.However, it should be noted, the Hadoop on its own doesn ' t enable data analytics. It ' s usually pa

object (Function-object), and this property is completely replaced if the variable object already has a property of the same name. VD all variable declaration (VAR, variabledeclaration) A property of the variable object, which consists of the variable name and the undefined value, if the variable name is the same as the formal parameter or function that has already been declared, The variable declaration does not interfere with such properties that already exist. }};Code embodiesaler

comments):int a = 123; // a是整数类型变量a = "ABC"; // 错误：不能把字符串赋给整型变量This is why dynamic languages are more flexible than static languages.Do not equate an equal sign of an assignment statement with a mathematical equal sign. For example, the following code:x = 10x = x + 2If mathematically understood x = x + 2 that is not tenable in any case, in the program, the assignment statement evaluates the right expression first x + 2 , obtains the result 12 , and a

true. In Python, equals = is an assignment statement, you can assign any data type to a variable, the same variable can be repeatedly assigned, and can be different types of variables, for example: a = 123 # A is an integer print (a) a = ' ABC ' # A changed to a string print (a) This type of variable itself is called Dynamic language, which corresponds to static language. Static languages must specify the variable type when defining the variable, and if the type does not match, an error is give

executed.This makes it very easy to traverse a list or tuple.Example of a scene exampleAfter the class exam, the teacher to statistical average results, 4 students are known to list the results are as follows:L = [75, 92, 59, 68]Please use the For loop to calculate the average score.L = [75, 92, 59, 68]sum = 0.0for i in L: sum = sum + iprint sum / 4Example TwoPrint 0,2,4,6,8.for i in range(0,10,2): print("loop",i)While loopAnother loop that differs from the For loop is the while loop, which doe

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right alignment. -Indicates left alignment. ' is a space that fills a space on the left side of a positive number to align with a negative number. 0 means using 0 padding.Width indicates display widthsPrecision indicates the precision after the decimal pointLike what:Print ("%+10x") print ("%04d"% 5) print ("%6.3f"% 2.3)The width above, precision is two integers. We can use * to dynamically substitute these two quantities. Like what:Print ("%.*f"% (4

variable is a stringAnswer = True #Answer A variable is a Boolean valueTrueIn Python, the equals sign = is an assignment statement that assigns any data type to a variable, the same variable can be repeatedly assigned, and can be a variable of different types , for example:123 # a是整数print(a)a = ‘ABC‘ # a变为字符串print(a)This type of variable itself is called Dynamic language, which corresponds to static language. Static languages must specify the variable type when defining the variable, and

This section reads as follows: Print output Using numbers Using strings Working with lists Judging using conditions Using loops Print outputIf we use the command-line interactive environment, you can output some numbers, strings, and variables directly if you need to use the print function in the. py file, for example: print(‘Hello Python‘) Using numbersA simple number contains integers and floating-point numbers, which can be used to

characters 10x, after the current position after inserting 3! , 3a! W moves forward one word (the cursor stops at the beginning of the word), and if it is at the end of the line, go to the start of the next line. This command is fast and can replace the L command.b Move backward one word 2b move backwards 2 wordsE, with W, except that the cursor stops at the tail of the word.GE, with B, the cursor stops at the end of the word.^ Moves to the first non

replaced by W.K Move up one characterJ Move down one characterThe above four commands can be used with the number, such as 20J is to move down 20 lines, 5h is to move 5 characters to the left, in vim, many commands can be used with the number, such as delete 10 characters 10x, after the current position after inserting 3! , 3a! W moves forward one word (the cursor stops at the beginning of the word), and if it is at the end of the line, go to the sta

complete.: Set Wrapscan re-search, when searching to the head or end of the file, return to continue the search, by default open.Replace commandThe RA replaces the current character with a, when the period character is the character of the cursor.s/old/new/replace new with old, replacing the first match of the current rows/old/new/g replace new with old, replacing all occurrences of the current row%s/old/new/replace new with old, replacing the first match of all rows%s/old/new/g replace new wit