The way to iterate over a range in bash is for i in {0..10}; do echo $i; done What would be the syntax for iterating over the sequence with a step? Say, I would like to get only even number in the above example. 6 Answers 6
This question already has answers here: Is there a built-in function to print all the current properties and values of an object? (29 answers) Closed last year. I have a python object with several attributes and methods. I want to iterate over object attributes. class my_python_obj(object): attr1=’a’ attr2=’b’ attr3=’c’ def method1(self, etc, etc): #Statements I … Read more
I just had a quick question regarding loops in Ruby. Is there a difference between these two ways of iterating through a collection? # way 1 @collection.each do |item| # do whatever end # way 2 for item in @collection # do whatever end Just wondering if these are exactly the same or if maybe … Read more
I know NSDictionaries as something where you need a key in order to get a value. But how can I iterate over all keys and values in a NSDictionary, so that I know what keys there are, and what values there are? I know there is something called a for-in-loop in JavaScript. Is there something … Read more
A reddit thread brought up an apparently interesting question: Tail recursive functions can trivially be converted into iterative functions. Other ones, can be transformed by using an explicit stack. Can every recursion be transformed into iteration? The (counter?)example in the post is the pair: (define (num-ways x y) (case ((= x 0) 1) ((= y … Read more
DataFrame: c_os_family_ss c_os_major_is l_customer_id_i 0 Windows 7 90418 1 Windows 7 90418 2 Windows 7 90418 Code: print df for name, group in df.groupby(‘l_customer_id_i’).agg(lambda x: ‘,’.join(x)): print name print group I’m trying to just loop over the aggregated data, but I get the error: ValueError: too many values to unpack @EdChum, here’s the expected output: … Read more
This question already has answers here: Loop backwards using indices in Python? (17 answers) Closed 5 years ago. I’m talking about doing something like: for(i=n; i>=1; –i) { //do something with i } I can think of some ways to do so in python (creating a list of range(1,n+1) and reverse it, using while and … Read more
I am trying to loop through an array. I have the following code: var currnt_image_list=”21,32,234,223″; var substr = currnt_image_list.split(‘,’); // array here Am trying to get all the data out of the array. Can some one lead me in the right path please? 12 Answers 12
I have a generator that generates a series, for example: def triangle_nums(): ”’Generates a series of triangle numbers”’ tn = 0 counter = 1 while True: tn += counter yield tn counter += + 1 In Python 2 I am able to make the following calls: g = triangle_nums() # get the generator g.next() # … Read more
This question already has answers here: What is the most “pythonic” way to iterate over a list in chunks? (38 answers) Closed 2 years ago. I want to loop through a Python list and process 2 list items at a time. Something like this in another language: for(int i = 0; i < list.length(); i+=2) … Read more
