int

问题 I have a Python script that reads in a .csv file and stores each of the values into a list of lists: list[x][y]. I don't have any issues with this. list = [] i = 0 for row in reader: list.append([]) list[i].append(row[0]) ... i += 1 I want to check one of these fields to see if it's an number (integer). When I perform a print type(list[i][0]) it returns a <type 'str'> even though the value is say 100. The if statements below are in a for loop iterating through the lists so what I was thinking

问题 Why is it that casting (int) can convert chars of a symbol to int properly, but "Character.getNumericValue('someSymbolCharValue');" can't? E.g. "Character.getNumericValue('?');" will return -1 even though the char can be presented as int with " (int) '?' " where it will return 63 回答1: A character's "numeric value" is not its ASCII/Unicode index value. The Character.getNumericValue method will attempt to convert the char to an int by applying the character's numeric meaning: Returns the int

问题 Why is it that casting (int) can convert chars of a symbol to int properly, but "Character.getNumericValue('someSymbolCharValue');" can't? E.g. "Character.getNumericValue('?');" will return -1 even though the char can be presented as int with " (int) '?' " where it will return 63 回答1: A character's "numeric value" is not its ASCII/Unicode index value. The Character.getNumericValue method will attempt to convert the char to an int by applying the character's numeric meaning: Returns the int

问题 Convert ((2.0,3.1),(7.0,4.2),(8.9,1.0),(-8.9,7)) to ((2,3),(7,4),(8,1),(-8,7)) It works to convert the tuple to a numpy array, and then apply .astype(int), but is there a more direct way? Also my 'solution' seems too special. It works to use numpy import numpy data = ((2.0,3.1),(7.0,4.2),(8.9,1.0),(-8.9,7)) data1 = numpy.array(data) data2 = data1.astype(int) data3 = tuple(tuple(row) for row in data2) data3 # ((2, 3), (7, 4), (8, 1), (-8, 7)) ((2, 3), (7, 4), (8, 1), (-8, 7)) as expected and

来源： https://stackoverflow.com/questions/16987461/extraction-of-integers-from-strings

来源： https://stackoverflow.com/questions/16987461/extraction-of-integers-from-strings

来源： https://stackoverflow.com/questions/27853301/do-not-understand-why-if-condition-evaluates-to-true-when-variable-is-integer

来源： https://stackoverflow.com/questions/12155908/convert-datetime-since-a-given-date-to-minutes

来源： https://stackoverflow.com/questions/43644203/why-in-one-case-multiplying-big-numbers-gives-a-wrong-result

来源： https://stackoverflow.com/questions/50421534/string-join-method-used-with-for-loop