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100_year = date.today().year - age + 100
^
SyntaxError: invalid decimal literal
I'm trying to understand what the problem is.
Python identifiers can not start with a number.
The 'arrow' points to year because underscore is a valid thousands separator in Python >= 3.6, so 100_000 is a valid integer literal.
Sadly in python you cant make variables that start with numbers so therefore you could use something like this:
hundred_year = date.today().year - age + 100
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I encountered a floating point problem when dealing with flow:
a = "0.0003"
b = pow(10, 4)
c = int(float(a) * b)) // int so i don't want the decimal places behind
i got the following result 2.9999999999999996 which is wrong
I also tried decimal:
c = int(Decimal(a) * Decimal(pow(10, 4)))
but still got the wrong result 2.999999999999999737189393390
Expected result is 3
In Javascript we can use bignumber.js
Is there a way i can avoid this kind of problem in python? maybe some library like in javascript
Thanks
Make sure a is the string, not the float. Then it should work.
int(Decimal('0.0003') * pow(10, 4))
# returns 3
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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 trying to use machine learning to predict students' future grade, but am stuck at the beginning.
Seems like pandas.read_csv cannot read psv file, I got:
df = pd.read_csv(‘training.psv’)
^
SyntaxError: invalid character in identifier
How can I read psv file through python?
The problem is in the quotes symbol. You should either use ' or ".
Try:
df = pd.read_csv('training.psv')
pd.read_csv("training.psv", sep = "|", header = FALSE, stringsAsFactors = FALSE)
That should work
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A problem exists in Python 2.7.11, with the print function:
elif e=="randomize w and x":
random=randint(int(w),int(x))
print random
elif e=="randomize w and y":
random=randint(int(w,int(y))
print random
The boldfaced print shows up as a syntax error, yet all 278 others in my program do not. Why this is, and how I fix it?
The problem is that in
random=randint(int(w,int(y))
a close parenthesis after w is missing, therefore Python thinks the expression continues on next line, but print at that point is a syntax error.
Your problem is not with the print statement, rather the line right before it. The line before hass inbalanced parenthesis:
random=randint(int(w,int(y))
Make sure you balance them out (add an extra ) at the end), and your error on the next line will disappear.
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Every time I try to run these first 2 lines in python, it says:
SyntaxError: invalid syntax
And highlights the name of the variable I'm trying to define (Yname).
These are the lines I'm trying to run:
print("Hello what's your name?")\
Yname = input("your name:")
It is because of the \ at the end of the first line.
in Python \ is the line continuation character. Python is trying to parse this as
print("Hello what's your name?")Yname = input("your name:")