📂 Python
Examples: python-learn
new_list = list() # объявление по уму
book_IDs = [1, 2, 3, 4, 5] # Declare dictionary
book_IDs.append(6) # append
book_IDs[0] *= 5 # access
len(book_IDs) # get size of dictionary
new_nums = nums[:] # create copy
word = list("word") # convert string to list
for id in book_IDs: # iterate
pass
if 1 in book_IDs: # check if number is there
pass
members = list(range(1, 6)) # = [1, 2, 3, 4, 5]
some_list = [12, 34, 56, 3.14, "abc"]
print(some_list)
print('List length: {}'.format(len(some_list)))
print(some_list[1])
print(some_list[1:3])
nums[:3] = [1, 1, 1] # replace first three elements with 1s
nums[:3] = [1] # replace first three elements with ONE 1
some_list[2] = "def" # lists are mutable unlike strings
# Concatenate lists
another_list = [27, 63, "mtg", 36.6, "abc"]
new_list = some_list + another_list # SLOW, do not use! Use extend instead
# Extend
some_list.extend(another_list) # Extend the list by appending all the items from the iterable. Equivalent to a[len(a):] = iterable.
# Adding items to lists
new_list.append("appended item")
new_list.insert(0, "inserted item")
# Removing items from list
new_list.pop() # = pop(-1) - remove last item. NB! pop returns deleted item
new_list.pop(0) # remove first item
new_list.remove("abc") # remove first entry of passed value
# Sorting
number_list = [9, 8, 7, 6, 5, 4, 1]
number_list.sort()
number_list.reverse()Cartesian product using list comprehension
from keyword import kwlist
DOMAINS = ["dev", "io"]
# Build list of Python keywords with each suffix in DOMAINS list:
site_domains = [f"{kw}.{domain}" for kw in kwlist for domain in DOMAINS]
print(site_domains)📂 Python | Последнее изменение: 07.02.2024 20:59