在 python 字符串变量中包括单引号和双引号

Question

I am trying to do an insert in postgres through python (psycopg2). I need to include both single and double quotes in the string that does the insert. This is my code:

table_name = "my_table"
values_to_insert = ["""O'neal""", '''"The Film "''']
column_name_list = ["UpperAndLowercase", "otherColumn"]

"INSERT INTO {} ".format(table_name) + ", ".join(['''"{}"'''.format(i) for i in 
column_name_list]) + " VALUES(" + ", ".join("""'''{}'''"""
.format(i).encode("utf-8").decode('unicode_escape') for i in values_to_insert)

I expected this:

'INSERT INTO my_table "UpperAndLowercase", "otherColumn" VALUES('''O'neal''', '''"The Film "''''

But got this:

'INSERT INTO my_table "UpperAndLowercase", "otherColumn" VALUES(\'\'\'O\'neal\'\'\', \'\'\'"The Film "\'\'\''

Answer 1

Are you using the python interpreter? Notice how x looks vs print(x) below.

If I put your code in a script and print it out it looks fine to me.

>>> table_name = "my_table"
>>> values_to_insert = ["""O'neal""", '''"The Film "''']
>>> column_name_list = ["UpperAndLowercase", "otherColumn"]
>>> 
>>> x = "INSERT INTO {} ".format(table_name) + ", ".join(['''"{}"'''.format(i) for i in
... column_name_list]) + " VALUES(" + ", ".join("""'''{}'''"""
... .format(i).encode("utf-8").decode('unicode_escape') for i in values_to_insert)
>>> x
'INSERT INTO my_table "UpperAndLowercase", "otherColumn" VALUES(\'\'\'O\'neal\'\'\', \'\'\'"The Film "\'\'\''
>>> print(x)
INSERT INTO my_table "UpperAndLowercase", "otherColumn" VALUES('''O'neal''', '''"The Film "'''
>>> 

Note also that you can just use triple """ instead of also using '''

s = """ this has 'single' and "double" quotes """

Answer 2

You can simplify your code a lot:

table_name = "my_table"
values_to_insert = ["O'neal", '"The Film "']
column_name_list = ["UpperAndLowercase", "otherColumn"]

print "INSERT INTO {} ".format(table_name) + ", ".join(['"{}"'.format(i) for i in column_name_list]) + " VALUES(" + ", ".join(["'''{}'''".format(i) for i in values_to_insert])

Outputs your desired result:

INSERT INTO my_table "UpperAndLowercase", "otherColumn" VALUES('''O'neal''', '''"The Film "'''