You can also use a counter for such problems. I've set it to 0 and for every iteration, it gets incremented by 1. So, to access the 2nd element cnt would be 2. You can add an if statement and print only Mark

friends = ["John", "Mark", "James"]
cnt=0
for friend in friends:
    cnt+=1
    if cnt==2:
         print(friend)

zip() will provide the required output.

xy = [[6.0, 0.5], [6.1, 1.0], [6.2, 1.5], [6.3, 2.0], [6.4, 2.5], [6.5, 3.0], [6.6, 3.5], [6.7, 4.0], [6.8, 4.5]]
x,y = zip(*xy)
print(x)
print(y)

Output:

(6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8)
(0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5)

zip() aggregates the elements from all the iterable. zip(x,y) would provide the list you currently have. zip() with * can be used to unzip a list.

Also, there is no need to convert the tuples to list since pyplot.plot() takes an array-like parameter.

import matplotlib.pyplot as plt
plt.plot(x,y)
plt.show()

Firstly, you shouldn't be using list as a variable name, as its already a built-in function.

Secondly you can get every odd indexed item by slicing [::2], and every even indexed item with [1::2], which is show below:

>>> my_list = ['first', 'second', 'third', 'fourth', 'fifth', 'sixth']
>>> print(my_list[::2])
['first', 'third', 'fifth']
>>> print(my_list[1::2])
['second', 'fourth', 'sixth']

Then you can just zip() the lists together and print them:

my_list = ['first', 'second', 'third', 'fourth', 'fifth', 'sixth']

for x, y in zip(my_list[::2], my_list[1::2]):
    print(x, y)

Which outputs:

first second
third fourth
fifth sixth

Maybe you try a map function In python 3:

 list(map(lambda l: l[2], z))

In python 2:

map(lambda l: l[2], z)

You should do:

for i in [2, 3]:
    print(li[i])

By range(n), you are getting [0, 1, 2, ..., n-1]

By range(m, n), you are getting [m, m+1, ..., n-1]

That is why you use range, getting a list of indices.

It is more recommended to use slicing like other fellows showed.

Another option is to use numpy.ndarray.

import numpy as np
list_of_numbers = [
    ('5', 2.5, 5200),
    ('6', 3.2, 5236),
    ('8', 5.4, 5287),
    ]
list_of_numbers = np.array(list_of_numbers)
p = list_of_numbers[:,1]
print(p)
# outputs: ['2.5' '3.2' '5.4']

In addition, since you're reading data from a text file, your first list should contain only str. (I really don’t understand how you get mixed strings and numbers using the method you describe in your question.) To fix that, you can either:

• use numpy.loadtxt,
• convert to float when switching to a ndarray: `np.array(list_of_numbers, dtype=float).

Finally, I strongly suggest that you learn about slices in Python.

As far as I understand from your question you only trying to print the words list which has more than one element.

One simple way to do it is:

    for line in open("testing.txt"):
       strip = line.rstrip()
       words = strip.split(';')
       # first = words[0]
       for test in words:
          if len(words) > 1:
             print(words)

Here you are just checking if the length of the words is greater than 1 and printing if that is the case

EDIT: I think the for loop is unnecessary. All you want is to print lists of words greater than length 1. So for that purpose:

    for line in open("testing.txt"):
       strip = line.rstrip()
       words = strip.split(';')
       if len(words) > 1:
          print(words)

Here you are just splitting the sentences on ; and then checking after splitting if the length of the list (named words) is greater than 1; if so you are printing the list named words.

EDIT2: As S3DEV had pointed out that you are opening a file inside for keyword which won't close your file automatically once you are out of for loop. As a result the file pointer remains open until the program stopped completely and it might cause weird issues. The best practice is to use with keyword. the with keyword automatically opens the file nad closes it once the block execution is complete, so you won't face any odd issues. form keeping a file pointer open.

    with open("testing.txt", "r") as f: # this line open file as f in read-only format
       for line in f:
          strip = line.rstrip()
          words = strip.split(';')
          if len(words) > 1:
             print(words)