빅데이터/파이썬

리스트 슬라이싱, set

예캉 2017. 7. 5. 11:10
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info='kim12365100 89 87'
print(info[:3])
print(info[3:8]) # :뒤 숫자는 포함이 안되기 때문에 +1해준다.
print(info[8:11])
print(info[11:14])
print(info[14:])
--------------------------------------------------------------------------
 
infov2='kim,12365,100,89,87'
r=infov2.split(",") #() 안에 구분자 넣으면 구분자로 나누어서 return해준다.
sum=0
for item in r:
    print(item)
    
for item in r[2:]:
    sum=sum+int(item)
print('합계는=>', sum)
 
--------------------------------------------------------------------------    
 
data=[1,2,3,4]
print(data[:2])
print(data[::-1])
 
 
list2list=[[1,2,4,6,8],[2,4,16,27,81,3]]
 
print('1,3의 요소는=>',(list2list[1][3]))
 
#grades = { "Joe":['1234',80,20,90],"Tim":['2314',87,95,95]}
a = {'name': 'pey', 'phone': '0119993323', 'birth': '1118'}
 
#print(joe_grade)
print(a.keys())
print(a.values())
---------------------------------------------------------------------------
 
tweet={"user":"joelgrus","text":"Data science is Awesome","retweet_count":100,"hashtags":["#data","#science","#datascience",'#awesome','#yolo']}
 
tweet_keys=tweet.keys()
tweet_values=tweet.values()
tweet_items=tweet.items()
 
print(tweet_keys)
print()
print(tweet_values)
print()
print(tweet_items)
 
print()
print()
print()
 
----------------------------------------------------------------------------
 
grades={"Joe":['1234',80,20,90],"Tim":['2314',87,95,95],"Kate":['3154',67,85,100]}
 
try:
    joe_grades=grades["Joe"]
except KeyError:
    print("no grade for Joe")
 
 
print(joe_grades)
print(grades.keys())
print(grades.values())
 
names=grades.keys()
for name in names:
    print('key=%s,value-%s'%(name,grades[name]))
    
-----------------------------------------------------------------------------
# set
s=set([1,2,2,3,4])
print(len(s))
print(list(s))
cs