How to create a string using for loop in python

As a beginner to Python I got these tasks by the teacher to finish and I'm stuck on one of them. It's about finding the consonants in a word using a for-loop and then create a string with those consonants.

The code I have is:

consonants = ["qwrtpsdfghjklzxcvbnm"]
summer_word = "icecream"

new_word = ""

for consonants in summer_word:
    new_word += consonants

ANSWER = new_word

The for-loop I get but it's the concatenation I don't really get. If I use new_word = [] it becomes a list, so I should use the ""? It should become a string if you concatenate a number of strings or characters, right? If you have an int you have to use str(int) in order to concatenate that as well. But, how do I create this string of consonants? I think my code is sound but it doesn't play out.

Regards

asked Sep 16, 2018 at 12:09

Your loop is currently just looping through the characters of summer_word. The name "consonants" you give in "for consonants..." is just a dummy variable, it doesn't actually reference consonants that you defined. Try something like this:

consonants = "qwrtpsdfghjklzxcvbnm" # This is fine don't need a list of a string.
summer_word = "icecream"

new_word = ""

for character in summer_word: # loop through each character in summer_word
    if character in consonants: # check whether the character is in the consonants list
        new_word += character
    else:
        continue # Not really necessary by adds structure. Just says do nothing if it isn't a consonant.

ANSWER = new_word

answered Sep 16, 2018 at 12:17

A string in Python is already a list of characters and may be treated as such:

In [3]: consonants = "qwrtpsdfghjklzxcvbnm"

In [4]: summer_word = "icecream"

In [5]: new_word = ""

In [6]: for i in summer_word:
   ...:     if i in consonants:
   ...:         new_word += i
   ...:

In [7]: new_word
Out[7]: 'ccrm'

answered Sep 16, 2018 at 12:15

Swagga TingSwagga Ting

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You are right, if the character is a number you must use str(int) to convert it in string type.

consonants = ["qwrtpsdfghjklzxcvbnm"]
summer_word = "icecream"

new_word = ""
vowels = 'aeiou'
for consonants in summer_word:
    if consonants.lower() not in vowels and type(consonants) != int:
        new_word += consonants
answer = new_word

Here inside the for loop you are evaluating if the 'consonants' is not a vowel and is not an int. Hope this help you.

answered Sep 16, 2018 at 12:21

SnedecorSnedecor

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The issue you have here is that you have created the variable consonants as a list with a string in it. So remove the square brackets and it should work

answered Sep 16, 2018 at 12:15

K-D-GK-D-G

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consonants = "qwrtpsdfghjklzxcvbnm"
summer_word = "icecream"

new_word = ""


for letter in summer_word:
    if letter in consonants:
      new_word += letter

print(new_word)

A shorter one would be

consonants = "qwrtpsdfghjklzxcvbnm"
summer_word = "icecream"

new_word = ""

new_word = [l for l in summer_word if l in consonants]
print("".join(new_word))

answered Sep 16, 2018 at 12:21

yoonghmyoonghm

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Python For Loops

A for loop is used for iterating over a sequence (that is either a list, a tuple, a dictionary, a set, or a string).

This is less like the for keyword in other programming languages, and works more like an iterator method as found in other object-orientated programming languages.

With the for loop we can execute a set of statements, once for each item in a list, tuple, set etc.

Example

Print each fruit in a fruit list:

fruits = ["apple", "banana", "cherry"]
for x in fruits:
  print(x)

Try it Yourself »

The for loop does not require an indexing variable to set beforehand.

Looping Through a String

Even strings are iterable objects, they contain a sequence of characters:

Example

Loop through the letters in the word "banana":

for x in "banana":
  print(x)

Try it Yourself »

The break Statement

With the break statement we can stop the loop before it has looped through all the items:

Example

Exit the loop when x is "banana":

fruits = ["apple", "banana", "cherry"]
for x in fruits:
  print(x)
  if x == "banana":
    break

Try it Yourself »

Example

Exit the loop when x is "banana", but this time the break comes before the print:

fruits = ["apple", "banana", "cherry"]
for x in fruits:
  if x == "banana":
    break
  print(x)

Try it Yourself »

The continue Statement

With the continue statement we can stop the current iteration of the loop, and continue with the next:

Example

Do not print banana:

fruits = ["apple", "banana", "cherry"]
for x in fruits:
  if x == "banana":
    continue
  print(x)

Try it Yourself »

The range() Function

To loop through a set of code a specified number of times, we can use the range() function,

The range() function returns a sequence of numbers, starting from 0 by default, and increments by 1 (by default), and ends at a specified number.

Note that range(6) is not the values of 0 to 6, but the values 0 to 5.

The range() function defaults to 0 as a starting value, however it is possible to specify the starting value by adding a parameter: range(2, 6), which means values from 2 to 6 (but not including 6):

The range() function defaults to increment the sequence by 1, however it is possible to specify the increment value by adding a third parameter: range(2, 30, 3):

Example

Increment the sequence with 3 (default is 1):

for x in range(2, 30, 3):
  print(x)

Try it Yourself »

Else in For Loop

The else keyword in a for loop specifies a block of code to be executed when the loop is finished:

Example

Print all numbers from 0 to 5, and print a message when the loop has ended:

for x in range(6):
  print(x)
else:
  print("Finally finished!")

Try it Yourself »

Note: The else block will NOT be executed if the loop is stopped by a break statement.

Example

Break the loop when x is 3, and see what happens with the else block:

for x in range(6):
  if x == 3: break
  print(x)
else:
  print("Finally finished!")

Try it Yourself »

Nested Loops

A nested loop is a loop inside a loop.

The "inner loop" will be executed one time for each iteration of the "outer loop":

Example

Print each adjective for every fruit:

adj = ["red", "big", "tasty"]
fruits = ["apple", "banana", "cherry"]

for x in adj:
  for y in fruits:
    print(x, y)

Try it Yourself »

The pass Statement

for loops cannot be empty, but if you for some reason have a for loop with no content, put in the pass statement to avoid getting an error.

Can we use for loop for string in Python?

How do you add a string to a for loop?

How do you pass a string in a for loop in Python?

How do you create a string in Python?