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When executing with Python it shows error:
return (x * (1.0 — x))
^
SyntaxError: invalid character in identifier
How do I correct it?
Use the correct character for you minus operator: -. You are using some other 'dash' character that the interpreter is considering just a name like y or x. But it is invalid!
>>> bad_minus = "—"
>>> good_minus = "-"
>>> bad_minus == good_minus
False
>>> ord(good_minus)
45
>>> ord(bad_minus)
8212
>>>
Assuming the character between 1.0 and x is supposed to be a minus sign, replace it with an actual minus sign.
Your minus is not a minus. It's a "em dash".
Try replacing this '—' with '-'.
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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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This code:
a = 10
b = 20
print(f "The variable a is {a} and the variable b is {b}.")
returns this error:
File "main.py", line 3
print (f "The variable a is {a} and the variable b is {b}")
^
SyntaxError: invalid syntax
The version I'm using is after 3.6, so it should work. I'm using Anaconda's prompt, if that's a problem.
you have a space between f and the string. Remove it and everything will work.
The syntax error points to the end of the string. If it pointed to the beginning of the string it would give you a better hint at the problem: after the f, which is interpreted as a variable in this case, a string is unexpected.
You need this:
a = 1
b = 2
test_str = f"{'The variable a is'} {a} {'and the variable b is '}{b}"
print(test_str)
Between the curly braces, string interpolation takes place. The variables for a and b are within two of the curly brace sets and hard-coded strings are within the other two.
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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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p = re.compile("[AG].{2}[ATG|ATA|AAG].{1}G")
regex_result = p.search('ZZZAXXATGXGZZZ')
regex_result.group()
'AXXATG'
I was expecting AXXATGXG instead.
Use a grouping construct (...) rather than a character class [...] around the alternatives:
p = re.compile("[AG].{2}(?:ATG|ATA|AAG).G")
^^^^^^^^^^^^^^^
The (?:ATG|ATA|AAG) matches 3 sequences: either a ATG, or ATA or AAG. The [ATG|ATA|AAG] character class matches 1 char, either A, T, G or |.
Note the {1} is redundant and can be removed.
Python:
import re
p = re.compile("[AG].{2}(?:ATG|ATA|AAG).G")
regex_result = p.search('ZZZAXXATGXGZZZ')
print(regex_result.group())
# => AXXATGXG
See IDEONE demo
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I've got a problem with my Python code. For some reason a comparison of two strings is always returning False.
def checkChanged(checkURL, currentMessage):
tempMessage = urllib.urlopen(checkURL)
tempMessage = tempMessage.read()
print (tempMessage + ". " + currentMessage + ".")
if (str(tempMessage) == str(currentMessage)):
print ("equal")
return False
else:
print ("not equal")
return True
(Assume indentation is correct. I had to re-format when inserting here)
The problem I think is the if statement, I have tried many variations where both string weren't enclosed by the str(), I have also tried is instead of == but it is False. I have printed both values on the line before just to check and they are infact equal. Am I missing something?