Iterating through functions using for loop

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I currently have multiple functions as below:

vect_1 = CountVectorizer(parameters)
vect_2 = CountVectorizer(parameters)
vect_3 = CountVectorizer(parameters)
vect_3 = CountVectorizer(parameters)

which I am trying to iterate each one of them. I've tried:

for i in range(4):
    vect = vect_[i]
    print vect

And I am struggling to correctly defining 'vect' part as it just becomes a string. Any ideas please?

Thanks


This is the pythonic way to do it, using a list:

vects = [
    CountVectorizer(parameters),
    CountVectorizer(parameters),
    CountVectorizer(parameters),
    CountVectorizer(parameters)
]

for v in vects:
    print v

Whenever you see that variable names are being generated dynamically from strings, that's a warning that you need a better data structure to represent your data. Like a list, or a dictionary.

Loops and iteration, This is the pythonic way to do it, using a list: vects = [ CountVectorizer(parameters​), CountVectorizer(parameters), CountVectorizer(parameters),  It does the iterating over an iterable. You can use an iterator to get the next value or to loop over it. Once, you loop over an iterator, there are no more stream values. Iterators use the lazy evaluation approach. Many built-in classes in Python are iterators. A generator function is a function which returns an iterator.


Of course not this, but try globals (in def use locals):

for i in range(1,5):
    vect = globals()['vect_%s'%i]
    print(vect)

Although still the most pythonic way is using @Oscar's solution

Iterating through functions using for loop, The standard syntax of using a for loop to iterate over an array is Without getting too deep in the weeds, a callback is a function that will be  Definite iteration loops are frequently referred to as for loops because for is the keyword that is used to introduce them in nearly all programming languages, including Python. Historically, programming languages have offered a few assorted flavors of for loop. These are briefly described in the following sections. Numeric Range Loop.


You can just loop through all your parameters.

vectors = []
parameters = []
#Put code for adding parameters here

for parameter in parameters:
    vectors.append(CountVectorizer(parameter))

This loops through the parameters you have set and runs the function with each parameter. You can now access all the outputs from the vectors list.

Stop Using For Loops to Iterate Over Arrays, I did not use it in this article as it involves the use of an anonymous function, which can be a confusing concept when you first see it. (But perhaps I should have  Iterating over dictionaries using 'for' loops d = {'x': 1, 'y': 2, 'z': 3} for key in d: How does Python recognize that it needs only to read the key from the dictionary? Is key a special word in Python? Or is it simply a variable? It's not just for loops. The important word here is "iterating". A dictionary is a mapping of keys to values:


I prefer using list or dict

def func_a(a):
    print(a)


def func_b(b):
    print(b, b)


def func_c(c):
    print(c, c, c)


def func_d(d):
    print(d, d, d, d)


# use list
func_list = [func_a, func_b, func_c, func_d]
for i in range(4):
    func_list[i](i)

# use dict
func_dict = {"vect_1": func_a,
             "vect_2": func_b,
             "vect_3": func_c,
             "vect_4": func_d}
for i in range(1, 5):
    func_dict["vect_" + str(i)](i)

which will print

0
1 1
2 2 2
3 3 3 3
1
2 2
3 3 3
4 4 4 4

Iterating over lists with loops, A for loop iterates through items the same way as while and do-while loops, but it can also iterate through a list or set. (You can use for loops with SOQL too, but  Iterate through a C++ Vector using a 'for' loop. I am new to the C++ language. I have been starting to use vectors, and have noticed that in all of the code I see to iterate though a vector via indices, the first parameter of the for loop is always something based on the vector.


Use a For Loop to Iterate Through a List Unit, This statement is the one used by C. The header of this kind of for loop The built-in function range() is the right function to iterate over a sequence of numbers​. Iterate over columns of a DataFrame using DataFrame.iteritems() Dataframe class provides a member function iteritems() i.e. It yields an iterator which can can be used to iterate over all the columns of a dataframe. For each column in the Dataframe it returns an iterator to the tuple containing the column name and column contents as series.


Python Tutorial: For Loops, We can use the range() function in for loops to iterate through a sequence of numbers. It can be combined with the len()  Answer: DON'T! Iteration in pandas is an anti-pattern, and is something you should only want to do when you have exhausted every other option possible. You should not consider using any function with " iter " in its name for anything more than a few thousand rows or you will have to get used to a lot of waiting.


Python for Loop, The range() function helps iterate over a sequence of numbers. We can print the numbers from 0 to 3. for number in range(4): print(number). When you use continue without a label, it terminates the current iteration of the innermost enclosing while, do-while, or for statement and continues execution of the loop with the next iteration. In contrast to the break statement, continue does not terminate the execution of the loop entirely.