I'm new to programming and I'm making a simple program to test. Here is the code:
list1 = [1,2,d,,t,h,7,8]
for x in list1:
if x ==
I'm trying to iterate in my list and check to see which item is a string and which is a number(I know its basic, but im new). So what would be a correct way to write this line of code. All suggestions would help
In Python, use the builtin isinstance(variable, type) to test whether a variable is of a given type.
The type variable can also be a tuple of several types to test against.
Your list is a little messed up. If those letters are supposed to be strings, it should look like this:
list1 = [1,2,'d','t','h',7,8]
Otherwise they are referring to variables.
To check if number
for x in list1:
if isinstance(x, int):
...
To check if string
for x in list1:
if isinstance(x, str):
...
Combination
for x in list1:
if x.isinstance(x, int):
....
elif isinstance(x, str)L
....
isdigit is a string function to detect if all characters in the string are numeric. In the OP's sample, the integer values are not strings, but actual integers.
This should print the type of each element in your list
for item in list1:
print type(item)
Assuming your list contains purely numbers and strings:
for x in list1:
if type(x) == str:
# do something
else:
# do something for numbers
isinstance is generally preferred practice over type(x)=='. Given an object that is an instance of class B which is a subclass of A, type(obj)==A` will evaluate as False, but isinstance(obj,A) will return True.Since everyone is giving answers similar to my old one (see below), I'll try something else.You can easily make 2 lists that separate ints and strings with Python's list comprehensions:
strings = [x for x in list1 if isinstance(x, str)]
intlist = [x for x in list1 if isinstance(x, int)]
Using list comprehensions made the code more compact and easier to understand.
Old response:
list1 = [1, 4, 5, '5', '3', 3, 'a']
for x in list1:
if(isinstance(x, str)):
print(str(x) + ' is a string.')
else:
print(str(x) + ' is not a string.')
You could try this one,
list1=[1,2,'d','t','h',7,8]
for data in list1:
if type(data) is str:
#do something with it
elif type(data) is int:
#do something with it
you can try something like this or any of those methods mentioned from other answers in the python interpreter to see it works -
>> type(1) is str
and you would get
>> False
