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Lära Strings slicing | Common data types
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Strings slicing

You can refer to element(s) in your string. To do that, use indexes inside square brackets and note that indexation in Python starts from 0, so for the string with 5 symbols ("Hello"), the last symbol ("o") will have index 4.

Also, you can get multiple symbols in one action. To do so, separate starting and finishing position plus 1 with : (for example, if you want elements with indexes from 1 to 4, you need to write 1:5, as the right limit is exclusive). At the same time, you can refer to elements in reverse order, i.e., call the very last element as the first in reverse order. Use the minus - sign to do it. If you want to know the total number of symbols in your string, use the len() function. Please note that numeration in reverse order starts from 1 (as there is no minus zero, which makes it logical).

For example:

12345678910
# create new string string = "This is string in Python" # let's get the first element print(string[0]) # let's get all the elements from index 3 to 8 print(string[3:9]) # let's get the last but one element print(string[-2]) # let's get the number of symbols in this string print(len(string))
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Given string "This is string for learning" assigned to variable test_str. You need to:

  1. Extract the very first and very last symbols.
  2. Extract word string.
  3. Get the length of this string.

Lösning

Switch to desktopByt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan
Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 3. Kapitel 5
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book
Strings slicing

You can refer to element(s) in your string. To do that, use indexes inside square brackets and note that indexation in Python starts from 0, so for the string with 5 symbols ("Hello"), the last symbol ("o") will have index 4.

Also, you can get multiple symbols in one action. To do so, separate starting and finishing position plus 1 with : (for example, if you want elements with indexes from 1 to 4, you need to write 1:5, as the right limit is exclusive). At the same time, you can refer to elements in reverse order, i.e., call the very last element as the first in reverse order. Use the minus - sign to do it. If you want to know the total number of symbols in your string, use the len() function. Please note that numeration in reverse order starts from 1 (as there is no minus zero, which makes it logical).

For example:

12345678910
# create new string string = "This is string in Python" # let's get the first element print(string[0]) # let's get all the elements from index 3 to 8 print(string[3:9]) # let's get the last but one element print(string[-2]) # let's get the number of symbols in this string print(len(string))
copy
Uppgift

Swipe to start coding

Given string "This is string for learning" assigned to variable test_str. You need to:

  1. Extract the very first and very last symbols.
  2. Extract word string.
  3. Get the length of this string.

Lösning

Switch to desktopByt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan
Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 3. Kapitel 5
Switch to desktopByt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan
Vi beklagar att något gick fel. Vad hände?
some-alt