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# Create a list of strings: flash
flash = ['jay garrick', 'barry allen', 'wally west', 'bart allen']

# Print each list item in flash using a for loop
for person in flash:
    print (person)


# Create an iterator for flash: superhero
superhero = iter(flash)

# Print each item from the iterator
print(next(superhero))
print(next(superhero))
print(next(superhero))
print(next(superhero))

# Start coding # Create an iterator for range(3): small_value
small_value = iter(range(3))

# Print the values in small_value
print(next(small_value))
print(next(small_value))
print(next(small_value))

# Loop over range(3) and print the values
for num in range(3):
    print(num)


# Create an iterator for range(10 ** 100): googol
googol = iter(range(10 ** 100))

# Print the first 5 values from googol
print(next(googol))
print(next(googol))
print(next(googol))
print(next(googol))
print(next(googol)) 
# Create a range object: values
values = range(10, 21)

# Print the range object
print(values)

# Create a list of integers: values_list
values_list = list(values)

# Print values_list
print(values_list)

# Get the sum of values: values_sum
values_sum = sum(values)

# Print values_sum
print(values_sum)

# Create a list of strings: mutants
mutants = ['charles xavier', 
            'bobby drake', 
            'kurt wagner', 
            'max eisenhardt', 
            'kitty pryde']

# Create a list of tuples: mutant_list
mutant_list = list(enumerate(mutants))

# Print the list of tuples
print(mutant_list)

# Unpack and print the tuple pairs
for index1, value1 in enumerate(mutants):
    print(index1, value1)

# Change the start index
for index2, value2 in enumerate(mutants, start=1):
    print(index2, value2)

    
    
    <script.py> output:
    [(0, 'charles xavier'), (1, 'bobby drake'), (2, 'kurt wagner'), (3, 'max eisenhardt'), (4, 'kitty pryde')]
    0 charles xavier
    1 bobby drake
    2 kurt wagner
    3 max eisenhardt
    4 kitty pryde
    1 charles xavier
    2 bobby drake
    3 kurt wagner
    4 max eisenhardt
    5 kitty pryde
# Create a list of tuples: mutant_data
mutant_data = list(zip(mutants, aliases, powers))

# Print the list of tuples
print(mutant_data)

# Create a zip object using the three lists: mutant_zip
mutant_zip = zip(mutants, aliases, powers)

# Print the zip object
print(mutant_zip)

# Unpack the zip object and print the tuple values
for value1, value2, value3 in mutant_zip:
    print(value1, value2, value3)
    
    
    <script.py> output:
    [('charles xavier', 'prof x', 'telepathy'), ('bobby drake', 'iceman', 'thermokinesis'), ('kurt wagner', 'nightcrawler', 'teleportation'), ('max eisenhardt', 'magneto', 'magnetokinesis'), ('kitty pryde', 'shadowcat', 'intangibility')]
    <zip object at 0x7f5cb0663900>
    charles xavier prof x telepathy
    bobby drake iceman thermokinesis
    kurt wagner nightcrawler teleportation
    max eisenhardt magneto magnetokinesis
    kitty pryde shadowcat intangibility
# Create a zip object from mutants and powers: z1
z1 = zip(mutants, powers)

# Print the tuples in z1 by unpacking with *
print(*z1)

# Re-create a zip object from mutants and powers: z1
z1 = zip(mutants, powers)

# 'Unzip' the tuples in z1 by unpacking with * and zip(): result1, result2
result1, result2 = zip(*z1)

# Check if unpacked tuples are equivalent to original tuples
print(result1 == mutants)
print(result2 == powers)



<script.py> output:
    ('charles xavier', 'telepathy') ('bobby drake', 'thermokinesis') ('kurt wagner', 'teleportation') ('max eisenhardt', 'magnetokinesis') ('kitty pryde', 'intangibility')
    True
    True
# Initialize an empty dictionary: counts_dict
counts_dict={}

# Iterate over the file chunk by chunk
for chunk in pd.read_csv('tweets.csv', chunksize=10):

    # Iterate over the column in DataFrame
    for entry in chunk['lang']:
        if entry in counts_dict.keys():
            counts_dict[entry] += 1
        else:
            counts_dict[entry] = 1

# Print the populated dictionary
print(counts_dict)



<script.py> output:
    {'en': 97, 'et': 1, 'und': 2}
# Define count_entries()
def count_entries(csv_file, c_size, colname):
    """Return a dictionary with counts of
    occurrences as value for each key."""
    
    # Initialize an empty dictionary: counts_dict
    counts_dict = {}

    # Iterate over the file chunk by chunk
    for chunk in pd.read_csv(csv_file, chunksize=c_size):

        # Iterate over the column in DataFrame
        for entry in chunk[colname]:
            if entry in counts_dict.keys():
                counts_dict[entry] += 1
            else:
                counts_dict[entry] = 1

    # Return counts_dict
    return counts_dict

# Call count_entries(): result_counts
result_counts = count_entries('tweets.csv', 10, "lang")

# Print result_counts
print(result_counts)


<script.py> output:
    {'en': 97, 'et': 1, 'und': 2}
# Create a 5 x 5 matrix using a list of lists: matrix
matrix = [[col for col in range(0,5)] for row in range(0,5)]

# Print the matrix
for row in matrix:
    print(row)

    
[0, 1, 2, 3, 4]
[0, 1, 2, 3, 4]
[0, 1, 2, 3, 4]
[0, 1, 2, 3, 4]
[0, 1, 2, 3, 4]
# Create a list of strings: fellowship
fellowship = ['frodo', 'samwise', 'merry', 'aragorn', 'legolas', 'boromir', 'gimli']

# Create list comprehension: new_fellowship
new_fellowship = [member for member in fellowship if len(member)>=7]

# Print the new list
print(new_fellowship)


<script.py> output:
    ['samwise', 'aragorn', 'legolas', 'boromir']
# Create a list of strings: fellowship
fellowship = ['frodo', 'samwise', 'merry', 'aragorn', 'legolas', 'boromir', 'gimli']

# Create list comprehension: new_fellowship
new_fellowship = [member if len(member) >=7 else "" for member in fellowship]

# Print the new list
print(new_fellowship)



<script.py> output:
    ['', 'samwise', '', 'aragorn', 'legolas', 'boromir', '']
# Create a list of strings: fellowship
fellowship = ['frodo', 'samwise', 'merry', 'aragorn', 'legolas', 'boromir', 'gimli']

# Create dict comprehension: new_fellowship
new_fellowship = {member:len(member) for member in fellowship}

# Print the new dictionary
print(new_fellowship)


{'frodo': 5, 'samwise': 7, 'merry': 5, 'aragorn': 7, 'legolas': 7, 'boromir': 7, 'gimli': 5}

# Create generator object: result
result = (num for num in range(0, 31))

# Print the first 5 values
print(next(result))
print(next(result))
print(next(result))
print(next(result))
print(next(result))

# Print the rest of the values
for value in result:
    print(value)

    
    
        print(value)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
# Create a list of strings: lannister
lannister = ['cersei', 'jaime', 'tywin', 'tyrion', 'joffrey']

# Create a generator object: lengths
lengths = (len(person) for person in lannister)

# Iterate over and print the values in lengths
for value in lengths:
    print(value)

    
    <script.py> output:
    6
    5
    5
    6
    7
# Create a list of strings
lannister = ['cersei', 'jaime', 'tywin', 'tyrion', 'joffrey']

# Define generator function get_lengths
def get_lengths(input_list):
    """Generator function that yields the
    length of the strings in input_list."""

    # Yield the length of a string
    for person in input_list:
        yield len(person)

# Print the values generated by get_lengths()
for value in get_lengths(lannister):
    print(value)
    
    
    6
5
5
6
7
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