Answers for "python filtering"

filter list with python

scores = [70, 60, 80, 90, 50]
filtered = filter(lambda score: score >= 70, scores)

print(list(filtered))

# Output:
[70, 80, 90]

python filtering

>>> numbers = [-2, -1, 0, 1, 2]

>>> # Using a lambda function
>>> positive_numbers = filter(lambda n: n > 0, numbers)
>>> positive_numbers
<filter object at 0x7f3632683610>
>>> list(positive_numbers)
[1, 2]

>>> # Using a user-defined function
>>> def is_positive(n):
...     return n > 0
...
>>> list(filter(is_positive, numbers))
[1, 2]

python filter

number_list = range(-5, 5)
less_than_zero = list(filter(lambda x: x < 0, number_list))
print(less_than_zero)

# Output: [-5, -4, -3, -2, -1]

python - filter function

# Filter function
def with_s(student):
    return student.startswith('s')

students = ['sarah', 'mary', 'sergio', 'lucy']   # define a list
s_filter = filter(with_s, students)              # filter() returns true or false
print(next(s_filter))                            # filter() returns a generator
print(list(s_filter))                            # give all elements of the generator