字符串

>>> "dwfre"
'dwfre'
>>> 'wf'
'wf'
>>> "afwer ''"#文本里含有单引号，那么外面就要用双引号
"afwer ''"
>>> 'weftr "" '#文本含有双引号，那么外面就要用单引号
'weftr "" '
>>> 'wfrg '' '
'wfrg  '
>>> "wefd ''"
"wefd ''"
\
>>> ''' fwerg
dgff""efer
''sfger '''
' fwerg\ndgff""efer\n\'\'sfger '
>>> ''' fwerg
dgff""efer
wgatt ''wefr '''
' fwerg\ndgff""efer\nwgatt \'\'wefr '#文本含有单双引号，用三引号

>>> s = 'sgfter \' ' # \后面的‘不是字符结束标志，只是普通的字符

s = ['所','个','人','的']
for i in range(4):
print(s[i])

def f(s):
cnt = 0
#注意tab
for c in s:
if c in 'edf':
cnt+=1
return cnt
print(f("defifff"))

6