[Python] 외부파일 다루기

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맥북에서 파일에서 읽고 한줄 씩 출력하기

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Sample 1 – Read – Display
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file_name = ‘/readtest1.txt’

f = open(file_name, ‘r’)
lines = f.readlines()
f.close()

line_num = 0
for line in lines:
line_No = line_num + 1
print(“{0}: {1}”.format(line_No, line),end=”)
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Sample 2 – Write – Display
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file_name = ‘/write_test.txt’

f = open(file_name, ‘w’)
f.write(“Python;\n”)
f.write(“c++;\n”)
f.write(“flutter;\n”)
f.close()

print(“created: “, file_name)
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Sample 3 – split str.split([sep]), str.strip([chars])
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Sample 4 – Jupyter Web Execution
jupyter notebook
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Sample 5 – str.join(seq)
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Sample 6 – str.find(search_str, [,start, end])
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Sample 7 – str.count(search_str, [,start, end]) ,,, startwith, endswith
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Sample 8 – str.replace(old_str, new_str[, count])
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Sample 9 – str.lower() str.upper()
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