如何修改 python 中的列表元素

Question

Given a list of filenames, we want to rename all the files with extension.hpp to the extension h. To do this, we would like to generate a new list called newfilenames, consisting of the new filenames. Fill in the blanks in the code using any of the methods you've learned thus far, like a for loop or a list comprehension.

filenames = ["program.c", "stdio.hpp", "sample.hpp", "a.out", "math.hpp", "hpp.out"]
# Generate newfilenames as a list containing the new filenames
# using as many lines of code as your chosen method requires.

---

print(newfilenames) 
# Should be ["program.c", "stdio.h", "sample.h", "a.out", "math.h", "hpp.out"]

Answer 1

newfilenames = [e.replace('.hpp','.h') for e in filenames]

Answer 2

filenames = ["program.c", "stdio.hpp", "sample.hpp", "a.out", "math.hpp", "hpp.out"]

newfilenames = []
for names in filenames:
    if names.endswith('.hpp'):
        newfilenames.append(names[:-2])
        continue
    newfilenames.append(names)


print(newfilenames) 

Answer 3

filenames = ["program.c", "stdio.hpp", "sample.hpp", "a.out", "math.hpp", "hpp.out"]

newfilenames=[]
for x in filenames:
    if x.endswith(".hpp"):
        newfilenames.append(x.replace(".hpp",".h"))
    else:
        newfilenames.append(x)     

print(newfilenames) 

Answer 4

filenames = ["program.c", "stdio.hpp", "sample.hpp", "a.out", "math.hpp", "hpp.out"]
newfilenames=[]
for filename in filenames:
    if '.hpp' in filename:
        index=filename.index(".")
        newfile=filename[:index]+".h"
        newfilenames.append(newfile)
    else:
        newfilenames.append(filename)

print(filenames)

Answer 5

filenames = ["program.c", "stdio.hpp", "sample.hpp", "a.out", "math.hpp", "hpp.out"]

newfilenames=[]

for filename in filenames:
    if filename.endswith(".hpp"):
        filename = filename.replace(".hpp", ".h")
        newfilenames.append(filename)
        
    else:
        newfilenames.append(filename)


print(newfilenames)

Answer 6

filenames = ["program.c", "stdio.hpp", "sample.hpp", "a.out", "math.hpp", "hpp.out"] # Generate newfilenames as a list containing the new filenames # using as many lines of code as your chosen method requires. newfilenames = [word.replace("hpp","h") if word.endswith("hpp") else word for word in filenames ] print(newfilenames) # Should be ["program.c", "stdio.h", "sample.h", "a.out", "math.h", "hpp.out"]

Answer 7

newfilenames = [ f.rstrip("pp") if f.endswith(".hpp") else f for f in filenames ]

Instead of str.replace() , I prefer using str.rstrip() and str.endswith() to take care of potential edge cases.

Answer 8

newfilenames = []
for names in filenames:
    if names.endswith('.hpp'):
        newfilenames.append(names[:-2])
        continue
    newfilenames.append(names)

Answer 9

def pig_latin(text):
    v = text.split()
    t = []
    for x in v:
        i = str(x[1:]) + str(x[0][0]) + 'ay'
        t.append(i)
    return t
    
print(pig_latin("hello how are you")) # Should be "ellohay owhay reaay ouyay"
print(pig_latin("programming in python is fun")) # Should be "rogrammingpay niay ythonpay siay unfay"