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this is my first question here but I've visited this site many times to find answers.
I'm facing what seems to be a really dumb problem.
I'm trying to create a '2d' list in python but a syntax error is teasing me.
Here is my code:
def gen2darr(row, column): # generates an array
for in range row:
arr.append([]) # create the lines
for i in range row:
for in range column:
arr[i].append(float(int(row*column*random)))
# fills the array, float(int( because I want floats that 'are ints',
# ex: 2.0 or 152.0
and here is what I get:
for in range row:
^
SyntaxError: invalid syntax
I've tried putting a value in the for loop in this way:
for j in range row:
but I then get this:
for j in range row:
^
SyntaxError: invalid syntax
Can someone help me with this?
For me syntax error means I'm likely missing a bracket or a coma somewhere but I cannot find it.
If you want to use a range, then you need to call the function:
for j in range(row):
range is not part of the Python syntax, it is just another built-in object type.
The syntax is:
for j in range(row):
range is a function taking an argument. And you have to specify which variable you will use to iterate (j)
The range function have following syntax: range(limit 1, limit 2), you pass like argument a size of array you want.
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I'm learning Python and there is a problem where I got stuck. I would definitely appreciate it if anyone can help to solve my doubts.
When I typed this code:
i=1 and i<=10
print(i)
the output is True. Obviously i is a boolean now but I don't understand why.
For there is an "and", and 1 is less than 10, so the statement "i=1 and i<=10" is true. But why the variable i (rather than the whole statement) becomes a boolean? I thought i should still be an integer whose value is 1?
It's a beginner's question but it really confuses me. Thanks for anyone who contributes an idea!
By your code , I think that you are setting ‘1 and i<=10’ into your i variable.
If you want check equal to 1 , use ‘==‘ and add an if sentence, so your code will be:
if i==1 and i<=10:
print(i)
The statement is to the right of the assignment operator =
1 and i<=10
i is not defined at this point in your example, so a NameError would be raised. I assume that you defined i somewhere before running this code and didn't see the error.
Had i been defined, the result of calculating this statement would be assigned back to i as it is to the left of the assignment operator =. Its the same as
i = (1 and i <= 10)
If you want to assign i before the comparison, then it needs to be in another statement
i = 1
i <= 10
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I am new here learning Python. I have a problem of syntax but I am unable to fix it. Can someone please help ?
Here's the code:
def saisie(the_list)
input_string = input("Enter a list elements separated by space (max 6)\n")
the_list = input_string.split()
if len(the_list) > 6:
return '{}Error'
return '{}Error'
else:
return f'user list: {the_list}'
saisie(liste)
and I got this error :
File "c:/Users/Jay/Desktop/Python Exercices/app/tribulle.py", line 6
def saisie(the_list)
^
SyntaxError: invalid syntax
Which is the invalid syntax, what should I change please?
When defining a function, you must put a colon at the end of the "def saisie(the_list)" or else Python will not know that you are defining a function.
You are missing the colon, it should be
def saisie(the_list):
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I am very new to Python and trying to learn by trial-and-error, so my question may sound naive for the community.
Let's say I have two empty lists with only the first element defined:
a = [[]]*20
a[0] = 0
b = [[]]*20
b[0] = 1
I want to use a for loop for creating the other elements of the lists:
x = 20
for i in range(1,x):
a[i] = b[i-1],
b[i] = a[i-1]+b[i-1]
What I obtain is the following error:TypeError: can only concatenate tuple (not "int") to tuple.
Basically I am trying to reproduce the fibonacci series (a famous starting point in Python tutorial), but I would like to experiment other ways of obtaining the same output.
Thank you!
The problem is on this line:
a[i] = b[i-1],
Notice the comma at the end? That makes python think you're dealing in tuples. Remove it and the error will be gone.
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I am creating a program in Python which is designed to organise a list, I have been using an insertion sort method, however when I execute the program, after I have input the list top organise, I am returned with the error "TypeError: 'function' object is not subscriptable"
My code is below:
def listsort(x):
for i in range(1,len(list)):
value = list[index]
i = index - 1
while i>=0:
if value < list[i]:
list[i+1] = list[i]
list[i] = value
i = i - 1
else:
break
Please help me understand where I have gone wrong here people, it's frying my brain....
list() is a python function.
You can't index functions.
Considering using a different variable name. (like x since that seems to be the list you are trying to sort)
It's worth noting that sort() and sorted() are also functions that you may use, but learning sorting methods is good practice.
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Suppose I have a list containing 9 fields, and the 9th field is a string.
Then print(line) will print the entire line, print(line[9]) will return something like:
1/0:.:PASS:90:204,90:201,88:48,39:-204,0,-90:-48,0,-39:14:9,5:5
but print(line[9[0:1]])
will return
File "FileParser.py", line 9, in ?
print(line[9[0:1]])
TypeError: unsubscriptable object
If I assign line[9] to a second var, then I can manipulate it like a string, but this seems like a silly extra step.
Is there a way to index directly into the string while still part of the list?
Thank you
You can index it like this
line[9][0:1]
line[9] will get the actual string and you get the range of characters from that string.
When you do line[9[0:1]] you are trying to get the range of values from the number 9, which is not possible. That is why your code fails.
Since line[9] is a string, then you have to do
line[9][0:1]
Let's say line[9] = "some string". Then you can manipulate it with
line[9][0:1]
which will be equivalent to
"some string"[0:1]