python使用textwrap包在已经生成的长字符串中嵌入回车符实战

Posted 2021-10-03 Data+Science+Insight

python使用textwrap包在已经生成的长字符串中嵌入回车符实战

目录

python使用textwrap包在已经生成的长字符串中嵌入回车符实战

# textwrap包在长字符串中嵌入回车符

#实战将多行文本写入pdf

---

有一个非常长的string字符串，我们需要写入到pdf或者word中，需要在字符串中加入换行符号，如何实施？

使用textwrap包；

 

# textwrap包在长字符串中嵌入回车符

import textwrap

strs = "In my project, I have a bunch of strings that are read in from a file. Most of them, when printed in the command console, exceed 80 characters in length and wrap around, looking ugly."

print(textwrap.fill(strs, 20))
In my project, I
have a bunch of
strings that are
read in from a file.
Most of them, when
printed in the
command console,
exceed 80 characters
in length and wrap
around, looking
ugly.

#实战将多行文本写入pdf

pdftext = json.dumps(result_values)
pdftext

import textwrap
print(textwrap.fill(pdftext, 100))

file = "test.txt"
with open(file, 'w') as f:
    f.write(textwrap.fill(pdftext, 100))

with open(file, 'r') as f:
    lines = f.readlines()
# lines
for line in lines:
    pass

#

from fpdf import FPDF
from PIL import Image
import os

def makePdf(pdfFileName, listPages):
    
    cover = Image.open(listPages[0])
    width, height = cover.size
    
    #pdf = FPDF(unit = "pt", format = [width, height])
    pdf = FPDF(unit = "mm",format = [width, height])
    
    ratio = height/width
    #print(ratio)
    for page in listPages:
        pdf.add_page()
        pdf.image(page, 0, 0,w=width,h=height)
    
    pdf.add_page()
    pdf.set_font('Arial', 'B', 14)
    #pdf.text(0, 0, str(pdftext))
    for index,line in enumerate(lines):
        y = (index+1)*20
        pdf.cell(0, y, line)
        #pdf.text(10, 10, pdftext)
    pdf.output(pdfFileName, "F")
    
# makePdf("result.pdf", [imgFileName for imgFileName in os.listdir('.') \\
# if imgFileName.endswith("png")])

makePdf(str(timestamp) +"graph.pdf", [imgFileName for imgFileName in final_filelist])

参考：A good way to make long strings wrap to newline?https://stackoverflow.com/questions/16430200/a-good-way-to-make-long-strings-wrap-to-newline

参考： Python File I/O | How to read write files in Python