新手剛開始學習Python時容易出現的錯誤

>>> while True print "hi~"
 File "<stdin>", line 1 
 while True print "hi~"
 ^
SyntaxError: invalid syntax

if spam == 42 print('Hello!')

if spam = 42: print('Hello!')

print('Hello!') 
 print('Howdy!')

if spam == 42: 
print('Hello!') 
print('Howdy!')

 if spam == 42: 
print('Hello!')

spam = ['cat', 'dog', 'mouse'] for i in range(spam): 
 print(spam[i])

spam = 'I have a pet cat.' 
spam[13] = 'r' print(spam)

spam = 'I have a pet cat.' 
spam = spam[:13] + 'r' + spam[14:] print(spam)

numEggs = 12 print('I have ' + numEggs + ' eggs.')

numEggs = 12 print('I have ' + str(numEggs) + ' eggs.')

 numEggs = 12 print('I have %s eggs.' % (numEggs))

print(Hello!') 或者: print('Hello!)

myName = 'Al' print('My name is ' + myName + . How are you?')

foobar = 'Al' print('My name is ' + fooba)

spam = ruond(4.2)

spam = Round(4.2)

spam = 'THIS IS IN LOWERCASE.' spam = spam.lowerr()

>>> 10 * (1/0)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>ZeroDivisionError: integer division or modulo by zero
>>> 4 + git*3
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>NameError: name 'git' is not defined
>>> '2' + 1
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>TypeError: cannot concatenate 'str' and 'int' objects
>>>

>>> while True:
... try:
... x = int(raw_input("Please enter a number: "))
... break... except ValueError:
... print "Oops! That was no valid number. Try again..."... 
Please enter a number: x
Oops! That was no valid number. Try again...
Please enter a number: 32x
Oops! That was no valid number. Try again...
Please enter a number: 038

... except (RuntimeError, TypeError, NameError):
... pass

import systry:
 f = open('myfile.txt')
 s = f.readline()
 i = int(s.strip())
except IOError as e: 
 print "I/O error({0}): {1}".format(e.errno, e.strerror)
except ValueError: 
 print "Could not convert data to an integer."
except: 
 print "Unexpected error:", sys.exc_info()[0] 
 raise

for arg in sys.argv[1:]: 
 try:
 f = open(arg, 'r') 
 except IOError: 
 print 'cannot open', arg 
 else: 
 print arg, 'has', len(f.readlines()), 'lines'
 f.close()

>>> try:
... raise Exception('spam', 'eggs')
... except Exception as inst:
... print type(inst)
... print inst.args
... print inst
... x, y = inst.args
... print 'x =', x
... print 'y =', y
... 
<type 'exceptions.Exception'>
('spam', 'eggs')
('spam', 'eggs')
x = spam
y = eggs

>>> def mdiv():
... x = 1/0
... 
>>> try:
... mdiv()
... except ZeroDivisionError as detail:
... print 'Handling run-time error:', detail
... 
Handling run-time error: integer division or modulo by zero

>>> class MyError(Exception):
... def __init__(self, value):
... self.value = value
... def __str__(self):
... return repr(self.value)
... 
>>> try:
... raise MyError(1+5)
... except MyError as e:
... print 'My exception occurred, value:', e.value
... 
My exception occurred, value: 6
>>> raise MyError('oops!')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
__main__.MyError: 'oops!'

class Error(Exception): 
 """Base class for exceptions in this module."""
 pass
 
class InputError(Error): 
 """Exception raised for errors in the input. 
 Attributes: 
 expr -- input expression in which the error occurred 
 msg -- explanation of the error """

 def __init__(self, expr, msg): 
 self.expr = expr 
 self.msg = msg
class TransitionError(Error): 
 """Raised when an operation attempts a state transition that's not 
 allowed. 
 
 Attributes: 
 prev -- state at beginning of transition 
 next -- attempted new state 
 msg -- explanation of why the specific transition is not allowed 
 """

 def __init__(self, prev, next, msg): 
 self.prev = prev 
 self.next = next
 self.msg = msg

someVar = 42 def myFunction(): 
 print(someVar) 
 someVar = 100 
 myFunction()

spam = range(10) 
spam[4] = -1

spam = list(range(10)) 
spam[4] = -1

spam = 1
spam++

spam = 1 
spam += 1

class Foo(): def myMethod(): 
 print('Hello!') a = Foo() a.myMethod()