Creating parts of strings¶
As we have seen before the find(string) function takes a target string as input and returns the index where that target string is found in the current string. If the string isn’t found it returns -1.
Note
The find function will return the first position it finds the given string in. Notice that above it printed 2 which means it found the “is” in “This” first.
Check your understanding
- 1
- The find function returns the index of the first position that contains the given string.
- 9
- This would be true if it was pos = str.find(" is").
- 10
- This would be true if it was pos = str.find(" is") and the first position was 1, but it is 0.
- -1
- A -1 is returned if the string you are looking for isn't found.
csp-17-6-2: What will be printed when the following executes?
str = "His shirt is red"
pos = str.find("is")
print(pos)
- 1
- Why would this return 1? What string was it looking for and where is that string in
str - 13
- This would be true if it was
str.find("red"). - 14
- This would be true if it was
str.find("red")and the first position was 1, but it is 0. - -1
- A -1 is returned when the string you are looking for isn't found. Remember that case matters in Python!
csp-17-6-3: What will be printed when the following executes?
str = "His shirt is red"
pos = str.find("Red")
print(pos)
You can use the find function along with the slice feature to get part of a string. To get a slice (part) of a string use stringName[start:end], which returns a new string with all the characters from the start position to one before the end position.
Say that you are looking for a name in a string but don’t know the exact position of the name in the string. However you do know that it will be after name:.