python convert dataframe to list

List is the most common Python data typeCreate a list Create a list >>> l = [1, 2, 3, 4, 5 ]>>> l[1, 2, 3, 4, 5] Create an empty list (Method 1) >>> l = []>>> l[] Create an empty list (Method 2

list, each character in the string becomes an element in the list.The list-to-string cannot go directly, because if the direct transfer takes the "[]" marker of the list as part of the string. List-to-string, we can only write a function to convert:1 li=[123,'sre', 567,true

; la.extend(lb)>>> la[1, 2, 3, 'qiwsir', 'python']>>> lb['qiwsir', 'python'] The example above shows how to append the lb to the end of the two lists, one is la and the other is lb, that is, to add all the elements in the lb to la, expand la. I must be curious when learning a program. in an interactive environment, I often experiment with my own ideas. sometimes I am stupid. >>> la = [1,2,3]>>> b = "abc">

append the lb to the end of the two lists, one is la and the other is lb, that is, to add all the elements in the lb to la, expand la. I must be curious when learning a program. In an interactive environment, I often experiment with my own ideas. Sometimes I am stupid. >>> la = [1,2,3]>>> b = "abc">>> la.extend(b)>>> la[1, 2, 3, 'a', 'b', 'c']>>> c = 5>>> la.extend(c)Traceback (most recent call last): File " In the above experiment, What do you learn about the official website? Originally, if e

iterable]. '''return [x for x in range (1, 10)] def str_to_list (s): ''' Using a string to convert list ''' if s! = None: return list (s) else: return [] def main (): test_listA = create_empty_list () print (test_listA) print ('#' * 50) test_listB = create_common_list () print (test_listB) print ('#' * 50) test_listC = create_common_list2 () print (test_listC) p

Recently prepared to learn Python system, in order to be able to find in time, first recorded.First of all, what is called sequence, before in use, feel the concept of a vague, today deliberately read the next, the sequence is the most basic data structure in Python, each element of the sequence is assigned an ordinal, that is, the position of the element, also become an index. Similar to "array".

follows: Copy the Code code as follows: L = [' spam ', ' spam ', ' spam! '] Operation: Python Expressions Results Description L[2] ' spam! ' Read the third element in the list L[-2] ' Spam ' Reads the second-to-last element in a list L[1:] [' Spam ', ' spam! '] To intercept a

another lb, to append lb to the back of LA, that is, to add all the elements of lb to LA, that is, let la expand. Learning procedures must be curious, I in the interactive environment, often experimenting with their own ideas, sometimes more foolish ideas. >>> La = [1,2,3]>>> B = "abc" >>> La.extend (b) >>> la[1, 2, 3, ' A ', ' B ', ' C ']>>> ; c = 5>>> La.extend (c) Traceback (most recent call last): File " ", line 1, in TypeError: ' int ' object is not itera

, everyone. That is a great magic show!")1.2Create a list of values1. Use function range ()The Python function range () allows you to easily generate a series of numbers. for in range (1,5): print(value)Range () just prints the digital 1~4, which is the result of the bad behavior you see frequently in programming languages. The function range () lets Python