In [1]:

    

import re


    

In [2]:

    

string = "li-7 1 DEN=3.327 .0784 908 end"


    

In [3]:

    

type(string)


    

    
Out[3]:





str

In [4]:

    

pattern = re.compile("327")


    

In [6]:

    

print(pattern.match(string))


    

    




None

In [7]:

    

print(pattern)


    

    




re.compile('327')

In [9]:

    

print(re.search(pattern, string))


    

    




<_sre.SRE_Match object; span=(13, 16), match='327'>

In [19]:

    

match = re.search(pattern,string)


    

In [11]:

    

match.string


    

    
Out[11]:





'li-7 1 DEN=3.327 .0784 908 end'

In [12]:

    

match.start()


    

    
Out[12]:





13

In [13]:

    

match.end()


    

    
Out[13]:





16

In [20]:

    

match.string[match.start():match.end()]


    

    




---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-20-34141f2a7f67> in <module>()
----> 1 match.string[match.start():match.end()]

AttributeError: 'NoneType' object has no attribute 'string'

In [15]:

    

pattern = re.compile(r'327.*908')


    

In [41]:

    

pattern = re.compile(r'(327.*)908')

match = re.search(pattern,string)
print(string)
print(match)

match.string[match.start():match.end()]


    

    




li-7 1 DEN=3.327 .0784 908 end
<_sre.SRE_Match object; span=(13, 26), match='327 .0784 908'>






    
Out[41]:





'327 .0784 908'

In [27]:

    

print(string)
print(pattern)


    

    




li-7 1 DEN=3.327 .0784 908 end
re.compile('(327.*)908')

In [48]:

    

pattern = r'(327.*)908'
my_regex = r'\g<1>' + str(984)
print(my_regex)


    

    




\g<1>984

In [49]:

    

print(re.sub(pattern, my_regex, string))
print(re.sub(pattern, r'\1',string))


    

    




li-7 1 DEN=3.327 .0784 984 end
li-7 1 DEN=3.327 .0784  end

In [28]:

    

print(r'1' + str(984))


    

    




1984

In [35]:

    

pattern2 = re.compile(r'\\'+str(84))
string2 = r'\84'


    

In [36]:

    

print(string2)


    

    




\84

In [37]:

    

match = re.search(pattern2,string2)
print(match)


    

    




<_sre.SRE_Match object; span=(0, 3), match='\\84'>

In [38]:

    

match.string[match.start():match.end()]


    

    
Out[38]:





'\\84'

In [50]:

    

i = 2
if i:
    print(i)


    

    




2

In [51]:

    

i = 0
if i:
    print(i)


    

In [52]:

    

i = None
if i:
    print(i)


    

In [53]:

    

i = 1
if i:
    print(i)


    

    




1

In [56]:

    

i = "donuts"
if i:
    print(i)
elif 1 == 1:
    print("wrong syntax")


    

    




donuts

In [61]:

    

print('{:06.2f}'.format(3.141592653589793))
print('{:.3f}'.format(3.141592653589793))


    

    




003.14
3.142

In [ ]: