Pythonでよく出るエラーメッセージとその解決方法

'1' + 1

python error1.py 
Traceback (most recent call last):
  File "error1.py", line 1, in 
    '1' + 1
TypeError: can only concatenate str (not "int") to str

strとintは結合できません。

'1' + '1'

1 + '1'

python error2.py 
Traceback (most recent call last):
  File "error2.py", line 1, in 
    1 + '1'
TypeError: unsupported operand type(s) for +: 'int' and 'str'

intとstrの結合はできません。

1 + 1

num = 1
    print(num)

python error3.py 
  File "error3.py", line 2
    print(num)
    ^
IndentationError: unexpected indent

num = 1
print(num)

print('aaa)

python error4.py 
  File "error4.py", line 1
    print('aaa)
              ^
SyntaxError: EOL while scanning string literal

print('aaa')

mylist = 1
mylist.append(2)

python error5.py 
Traceback (most recent call last):
  File "error5.py", line 2, in 
    mylist.append(2)
AttributeError: 'int' object has no attribute 'append'

mylist = [1]
mylist.append(2)

def myfunc(arg1, arg2):
    print(arg1, arg2)

myfunc(1)

python error6.py 
Traceback (most recent call last):
  File "error6.py", line 4, in 
    myfunc(1)
TypeError: myfunc() missing 1 required positional argument: 'arg2'

def myfunc(arg1, arg2):
    print(arg1, arg2)

myfunc(1, 2)

def myfunc(arg1, arg2):
    print(arg1, arg2)

myfunc(1, 2, 3)

python error7.py 
Traceback (most recent call last):
  File "error7.py", line 4, in 
    myfunc(1, 2, 3)
TypeError: myfunc() takes 2 positional arguments but 3 were given

def myfunc(arg1, arg2):
    print(arg1, arg2)

myfunc(1, 2)

mylist = [1, 2, 3]
print(mylist[3])

python error8.py 
Traceback (most recent call last):
  File "error8.py", line 2, in 
    print(mylist[3])
IndexError: list index out of range

mylist = [1, 2, 3]
print(mylist[2])

mydict = {'a': 1, 'b': 2, 'c': 3}
print(mydict['d'])

python error9.py 
Traceback (most recent call last):
  File "error9.py", line 2, in 
    print(mydict['d'])
KeyError: 'd'

mydict = {'a': 1, 'b': 2, 'c': 3}
print(mydict['c'])