Python Day-csv 文件、字符串方法、ASCII、任务

f =open("sample.txt", "r")

with open("sample.txt",’r’) as f:

player,score
virat,80
rohit,90
dhoni,100

import csv
f =open("score.csv", "r")
csv_reader = csv.reader(f)
for row in csv_reader:
    print(row)
f.close()

['player', 'score']
['virat', '80']
['rohit', '90']
['dhoni', '100']

for row in range(5):
    for col in range(row+1):
        print(chr(col+65), end=' ')
    print()

a 
a b 
a b c 
a b c d 
a b c d e 

for row in range(5):
    for col in range(5-row):
        print(chr(row+65), end=' ')
    print()

a a a a a 
b b b b 
c c c 
d d 
e 

name = 'guru'
for letter in name:
    print(letter,end=' ')

name = 'guru'
i = 0
while i<len(name):
    print(name[i],end=' ')
    i+=1

g u r u

txt = "hello, and welcome to my world."

first = txt[0]
if first>='a' and first<='z':
    first = ord(first)-32
    first = chr(first)

print(f"{first}{txt[1:]}")

hello, and welcome to my world.

txt = "guruprasanna!"

for letter in txt:
    if letter>='a' and letter<'z':
        letter = ord(letter)+32
        letter = chr(letter)
    print(letter,end='')

guruprasanna!

txt = "i love apples, apple is my favorite fruit"
key = 'apple'
l = len(key)
count = 0
start = 0 
end = l
while end<len(txt):
    if txt[start:end] == key:
        count+=1
    start+=1
    end+=1
else:
    print(count)

2

#first occurrence of given key
txt = "i love apples, apple is my favorite fruit"
key = 'apple'
l = len(key)
start = 0 
end = l
while end<len(txt):
    if txt[start:end] == key:
        print(start)
        break
    start+=1
    end+=1

7

#last occurrence of given key
txt = "i love apples, apple is my favorite fruit"
key = 'apple'
l = len(key)
start = 0 
end = l
final = 0
while end<len(txt):
    if txt[start:end] == key:
        final = start
    start+=1
    end+=1
else:
    print(final)

15

1   2   3   4   5   6   7   
1   2   3   4   5
1   2   3
1

for row in range(4):
    for col in range(7-(row*2)):
        print((col+1), end=' ')
    print()